feat(util): add go ping for flash sdk

. #22200563

Signed-off-by: slasher <mcq.sejust@gmail.com>

go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/dustin/go-humanize v1.0.1
 	github.com/edsrzf/mmap-go v1.1.0
 	github.com/fatih/color v1.15.0
+	github.com/go-ping/ping v1.1.0
 	github.com/gogo/protobuf v1.3.2
 	github.com/golang/mock v1.6.0
 	github.com/golang/protobuf v1.5.3

go.sum

@@ -175,6 +175,8 @@ github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG
 github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
 github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
 github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
+github.com/go-ping/ping v1.1.0 h1:3MCGhVX4fyEUuhsfwPrsEdQw6xspHkv5zHsiSoDFZYw=
+github.com/go-ping/ping v1.1.0/go.mod h1:xIFjORFzTxqIV/tDVGO4eDy/bLuSyawEeojSm3GfRGk=
 github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
 github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
 github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
@@ -250,6 +252,7 @@ github.com/google/pprof v0.0.0-20200430221834-fc25d7d30c6d/go.mod h1:ZgVRPoUq/hf
 github.com/google/pprof v0.0.0-20200708004538-1a94d8640e99/go.mod h1:ZgVRPoUq/hfqzAqh7sHMqb3I9Rq5C59dIz2SbBwJ4eM=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
@@ -679,6 +682,7 @@ golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210410081132-afb366fc7cd1/go.mod h1:9tjilg8BloeKEkVJvy7fQ90B1CfIiPueXVOjqfkSzI8=
 golang.org/x/net v0.0.0-20210525063256-abc453219eb5/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
@@ -760,6 +764,7 @@ golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

sdk/data/stream/extent_flash_cache.go

@@ -34,6 +34,7 @@ import (
 	"github.com/cubefs/cubefs/util/bloom"
 	"github.com/cubefs/cubefs/util/btree"
 	"github.com/cubefs/cubefs/util/errors"
+	"github.com/cubefs/cubefs/util/iputil"
 	"github.com/cubefs/cubefs/util/log"
 )
 
@@ -418,11 +419,9 @@ func (rc *RemoteCache) refreshHostLatency() {
 
 func (rc *RemoteCache) updateHostLatency(hosts []string) {
 	for _, host := range hosts {
-		// avgTime, err := iputil.PingWithTimeout(strings.Split(host, ":")[0], pingCount, pingTimeout*pingCount)
-		// TODO: add ping
-		avgTime, err := 0, errors.New("TODO")
+		avgRtt, err := iputil.PingWithTimeout(strings.Split(host, ":")[0], pingCount, pingTimeout*pingCount)
 		if err == nil {
-			rc.hostLatency.Store(host, avgTime)
+			rc.hostLatency.Store(host, avgRtt)
 		} else {
 			rc.hostLatency.Delete(host)
 			log.LogWarnf("updateHostLatency: host(%v) err(%v)", host, err)

util/iputil/ip.go

@@ -20,6 +20,9 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"time"
+
+	"github.com/go-ping/ping"
 )
 
 var (
@@ -136,3 +139,19 @@ const DEFAULT_MAX_DISTANCE = 128
 func GetDistance(a, b net.IP) int {
 	return DEFAULT_MAX_DISTANCE - commonPrefixLen(a, b)
 }
+
+// PingWithTimeout ping to addr.
+func PingWithTimeout(addr string, count int, timeout time.Duration) (avgRtt time.Duration, err error) {
+	pinger, err := ping.NewPinger(addr)
+	if err != nil {
+		return
+	}
+	pinger.Count = count
+	pinger.Timeout = timeout
+	pinger.Interval = 50 * time.Microsecond
+	pinger.SetPrivileged(true)
+	if err = pinger.Run(); err != nil {
+		return
+	}
+	return pinger.Statistics().AvgRtt, nil
+}

util/iputil/ip_test.go

@@ -17,6 +17,7 @@ package iputil_test
 import (
 	"net/http"
 	"testing"
+	"time"
 
 	"github.com/cubefs/cubefs/util/iputil"
 	"github.com/stretchr/testify/require"
@@ -41,3 +42,11 @@ func TestGetRealIp(t *testing.T) {
 	request.Header.Add("X-Real-Ip", ip)
 	require.Equal(t, iputil.RealIP(request), ip)
 }
+
+func TestPing(t *testing.T) {
+	_, err := iputil.PingWithTimeout("not-domain-x/", 10, time.Second)
+	require.Error(t, err)
+	rtt, err := iputil.PingWithTimeout("127.0.0.1", 10, time.Second)
+	require.NoError(t, err)
+	t.Log(rtt)
+}

vendor/github.com/agiledragon/gomonkey/v2/jmp_amd64.go

@@ -1,17 +1,18 @@
 package gomonkey
 
 func buildJmpDirective(double uintptr) []byte {
-	d0 := byte(double)
-	d1 := byte(double >> 8)
-	d2 := byte(double >> 16)
-	d3 := byte(double >> 24)
-	d4 := byte(double >> 32)
-	d5 := byte(double >> 40)
-	d6 := byte(double >> 48)
-	d7 := byte(double >> 56)
+    d0 := byte(double)
+    d1 := byte(double >> 8)
+    d2 := byte(double >> 16)
+    d3 := byte(double >> 24)
+    d4 := byte(double >> 32)
+    d5 := byte(double >> 40)
+    d6 := byte(double >> 48)
+    d7 := byte(double >> 56)
 
-	return []byte{
-		0x48, 0xBA, d0, d1, d2, d3, d4, d5, d6, d7, // MOV rdx, double
-		0xFF, 0x22, // JMP [rdx]
-	}
+    return []byte{
+        0x48, 0xBA, d0, d1, d2, d3, d4, d5, d6, d7, // MOV rdx, double
+        0xFF, 0x22,     // JMP [rdx]
+    }
 }
+

vendor/github.com/agiledragon/gomonkey/v2/modify_binary_windows.go

@@ -1,25 +1,25 @@
 package gomonkey
 
 import (
-	"syscall"
-	"unsafe"
+    "syscall"
+    "unsafe"
 )
 
 func modifyBinary(target uintptr, bytes []byte) {
-	function := entryAddress(target, len(bytes))
-
-	proc := syscall.NewLazyDLL("kernel32.dll").NewProc("VirtualProtect")
-	const PROT_READ_WRITE = 0x40
-	var old uint32
-	result, _, _ := proc.Call(target, uintptr(len(bytes)), uintptr(PROT_READ_WRITE), uintptr(unsafe.Pointer(&old)))
-	if result == 0 {
-		panic(result)
-	}
-	copy(function, bytes)
-
-	var ignore uint32
-	result, _, _ = proc.Call(target, uintptr(len(bytes)), uintptr(old), uintptr(unsafe.Pointer(&ignore)))
-	if result == 0 {
-		panic(result)
-	}
-}
+    function := entryAddress(target, len(bytes))
+    
+    proc := syscall.NewLazyDLL("kernel32.dll").NewProc("VirtualProtect")
+    const PROT_READ_WRITE = 0x40
+    var old uint32
+    result, _, _ := proc.Call(target, uintptr(len(bytes)), uintptr(PROT_READ_WRITE), uintptr(unsafe.Pointer(&old)))
+    if result == 0 {
+        panic(result)
+    }
+    copy(function, bytes)
+    
+    var ignore uint32
+    result, _, _ = proc.Call(target, uintptr(len(bytes)), uintptr(old), uintptr(unsafe.Pointer(&ignore)))
+    if result == 0 {
+        panic(result)
+    }
+}

vendor/github.com/go-ping/ping/.editorconfig

@@ -0,0 +1,16 @@
+# https://editorconfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+
+[Makefile]
+indent_style = tab
+
+[*.go]
+indent_style = tab

vendor/github.com/go-ping/ping/.gitignore

@@ -0,0 +1,2 @@
+/ping
+/dist

vendor/github.com/go-ping/ping/.golangci.yml

@@ -0,0 +1,6 @@
+---
+issues:
+  exclude-rules:
+  - path: _test.go
+    linters:
+    - errcheck

vendor/github.com/go-ping/ping/.goreleaser.yml

@@ -0,0 +1,46 @@
+project_name: ping
+before:
+  hooks:
+  - go mod download
+builds:
+- binary: ping
+  dir: cmd/ping
+  goarch:
+  - amd64
+  - arm
+  - arm64
+  goarm:
+  - 6
+  - 7
+  goos:
+  - darwin
+  - freebsd
+  - linux
+  - windows
+archives:
+- files:
+  - LICENSE
+  - README.md
+  format_overrides:
+  - goos: windows
+    format: zip
+  wrap_in_directory: true
+# TODO: Decide if we want packages (name conflcits with /bin/ping?)
+# nfpms:
+#   homepage: https://github.com/go-ping/ping
+#   maintainer: 'Go Ping Maintainers <go-ping@example.com>'
+#   description: Ping written in Go.
+#   license: MIT
+#   formats:
+#   - deb
+#   - rpm
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-{{ .ShortCommit }}"
+changelog:
+  sort: asc
+  filters:
+    exclude:
+    - '^docs:'
+    - '^test:'

vendor/github.com/go-ping/ping/CONTRIBUTING.md

@@ -0,0 +1,44 @@
+# Contributing
+
+First off, thanks for taking the time to contribute!
+
+Remember that this is open source software so please consider the other people who will read your code.
+Make it look nice for them, document your logic in comments and add or update the unit test cases.
+
+This library is used by various other projects, companies and individuals in live production environments so please discuss any breaking changes with us before making them.
+Feel free to join us in the #go-ping channel of the [Gophers Slack](https://invite.slack.golangbridge.org/).
+
+## Pull Requests
+
+[Fork the repo on GitHub](https://github.com/go-ping/ping/fork) and clone it to your local machine.
+
+```bash
+git clone https://github.com/YOUR_USERNAME/ping.git && cd ping
+```
+
+Here is a guide on [how to configure a remote repository](https://docs.github.com/en/free-pro-team@latest/github/collaborating-with-issues-and-pull-requests/configuring-a-remote-for-a-fork).
+
+Check out a new branch, make changes, run tests, commit & sign-off, then push branch to your fork.
+
+```bash
+$ git checkout -b <BRANCH_NAME>
+# edit files
+$ make style vet test
+$ git add <CHANGED_FILES>
+$ git commit -s
+$ git push <FORK> <BRANCH_NAME>
+```
+
+Open a [new pull request](https://github.com/go-ping/ping/compare) in the main `go-ping/ping` repository.
+Please describe the purpose of your PR and remember link it to any related issues.
+
+*We may ask you to rebase your feature branch or squash the commits in order to keep the history clean.*
+
+## Development Guides
+
+- Run `make style vet test` before committing your changes.
+- Document your logic in code comments.
+- Add tests for bug fixes and new features.
+- Use UNIX-style (LF) line endings.
+- End every file with a single blank line.
+- Use the UTF-8 character set.

vendor/github.com/go-ping/ping/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016 Cameron Sparr and contributors.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/go-ping/ping/Makefile

@@ -0,0 +1,32 @@
+GO           ?= go
+GOFMT        ?= $(GO)fmt
+GOOPTS       ?=
+GO111MODULE  :=
+pkgs          = ./...
+
+all: style vet build test
+
+.PHONY: build
+build:
+	@echo ">> building ping"
+	GO111MODULE=$(GO111MODULE) $(GO) build $(GOOPTS) ./cmd/ping
+
+.PHONY: style
+style:
+	@echo ">> checking code style"
+	@fmtRes=$$($(GOFMT) -d $$(find . -path ./vendor -prune -o -name '*.go' -print)); \
+	if [ -n "$${fmtRes}" ]; then \
+		echo "gofmt checking failed!"; echo "$${fmtRes}"; echo; \
+		echo "Please ensure you are using $$($(GO) version) for formatting code."; \
+		exit 1; \
+	fi
+
+.PHONY: test
+test:
+	@echo ">> running all tests"
+	GO111MODULE=$(GO111MODULE) $(GO) test -race -cover $(GOOPTS) $(pkgs)
+
+.PHONY: vet
+vet:
+	@echo ">> vetting code"
+	GO111MODULE=$(GO111MODULE) $(GO) vet $(GOOPTS) $(pkgs)

vendor/github.com/go-ping/ping/README.md

@@ -0,0 +1,141 @@
+# go-ping
+[![PkgGoDev](https://pkg.go.dev/badge/github.com/go-ping/ping)](https://pkg.go.dev/github.com/go-ping/ping)
+[![Circle CI](https://circleci.com/gh/go-ping/ping.svg?style=svg)](https://circleci.com/gh/go-ping/ping)
+
+A simple but powerful ICMP echo (ping) library for Go, inspired by
+[go-fastping](https://github.com/tatsushid/go-fastping).
+
+Here is a very simple example that sends and receives three packets:
+
+```go
+pinger, err := ping.NewPinger("www.google.com")
+if err != nil {
+	panic(err)
+}
+pinger.Count = 3
+err = pinger.Run() // Blocks until finished.
+if err != nil {
+	panic(err)
+}
+stats := pinger.Statistics() // get send/receive/duplicate/rtt stats
+```
+
+Here is an example that emulates the traditional UNIX ping command:
+
+```go
+pinger, err := ping.NewPinger("www.google.com")
+if err != nil {
+	panic(err)
+}
+
+// Listen for Ctrl-C.
+c := make(chan os.Signal, 1)
+signal.Notify(c, os.Interrupt)
+go func() {
+	for _ = range c {
+		pinger.Stop()
+	}
+}()
+
+pinger.OnRecv = func(pkt *ping.Packet) {
+	fmt.Printf("%d bytes from %s: icmp_seq=%d time=%v\n",
+		pkt.Nbytes, pkt.IPAddr, pkt.Seq, pkt.Rtt)
+}
+
+pinger.OnDuplicateRecv = func(pkt *ping.Packet) {
+	fmt.Printf("%d bytes from %s: icmp_seq=%d time=%v ttl=%v (DUP!)\n",
+		pkt.Nbytes, pkt.IPAddr, pkt.Seq, pkt.Rtt, pkt.Ttl)
+}
+
+pinger.OnFinish = func(stats *ping.Statistics) {
+	fmt.Printf("\n--- %s ping statistics ---\n", stats.Addr)
+	fmt.Printf("%d packets transmitted, %d packets received, %v%% packet loss\n",
+		stats.PacketsSent, stats.PacketsRecv, stats.PacketLoss)
+	fmt.Printf("round-trip min/avg/max/stddev = %v/%v/%v/%v\n",
+		stats.MinRtt, stats.AvgRtt, stats.MaxRtt, stats.StdDevRtt)
+}
+
+fmt.Printf("PING %s (%s):\n", pinger.Addr(), pinger.IPAddr())
+err = pinger.Run()
+if err != nil {
+	panic(err)
+}
+```
+
+It sends ICMP Echo Request packet(s) and waits for an Echo Reply in
+response. If it receives a response, it calls the `OnRecv` callback
+unless a packet with that sequence number has already been received,
+in which case it calls the `OnDuplicateRecv` callback. When it's
+finished, it calls the `OnFinish` callback.
+
+For a full ping example, see
+[cmd/ping/ping.go](https://github.com/go-ping/ping/blob/master/cmd/ping/ping.go).
+
+## Installation
+
+```
+go get -u github.com/go-ping/ping
+```
+
+To install the native Go ping executable:
+
+```bash
+go get -u github.com/go-ping/ping/...
+$GOPATH/bin/ping
+```
+
+## Supported Operating Systems
+
+### Linux
+This library attempts to send an "unprivileged" ping via UDP. On Linux,
+this must be enabled with the following sysctl command:
+
+```
+sudo sysctl -w net.ipv4.ping_group_range="0 2147483647"
+```
+
+If you do not wish to do this, you can call `pinger.SetPrivileged(true)`
+in your code and then use setcap on your binary to allow it to bind to
+raw sockets (or just run it as root):
+
+```
+setcap cap_net_raw=+ep /path/to/your/compiled/binary
+```
+
+See [this blog](https://sturmflut.github.io/linux/ubuntu/2015/01/17/unprivileged-icmp-sockets-on-linux/)
+and the Go [x/net/icmp](https://godoc.org/golang.org/x/net/icmp) package
+for more details.
+
+### Windows
+
+You must use `pinger.SetPrivileged(true)`, otherwise you will receive
+the following error:
+
+```
+socket: The requested protocol has not been configured into the system, or no implementation for it exists.
+```
+
+Despite the method name, this should work without the need to elevate
+privileges and has been tested on Windows 10. Please note that accessing
+packet TTL values is not supported due to limitations in the Go
+x/net/ipv4 and x/net/ipv6 packages.
+
+### Plan 9 from Bell Labs
+
+There is no support for Plan 9. This is because the entire `x/net/ipv4` 
+and `x/net/ipv6` packages are not implemented by the Go programming 
+language.
+
+## Maintainers and Getting Help:
+
+This repo was originally in the personal account of
+[sparrc](https://github.com/sparrc), but is now maintained by the
+[go-ping organization](https://github.com/go-ping).
+
+For support and help, you usually find us in the #go-ping channel of
+Gophers Slack. See https://invite.slack.golangbridge.org/ for an invite
+to the Gophers Slack org.
+
+## Contributing
+
+Refer to [CONTRIBUTING.md](https://github.com/go-ping/ping/blob/master/CONTRIBUTING.md)

vendor/github.com/go-ping/ping/logger.go

@@ -0,0 +1,53 @@
+package ping
+
+import "log"
+
+type Logger interface {
+	Fatalf(format string, v ...interface{})
+	Errorf(format string, v ...interface{})
+	Warnf(format string, v ...interface{})
+	Infof(format string, v ...interface{})
+	Debugf(format string, v ...interface{})
+}
+
+type StdLogger struct {
+	Logger *log.Logger
+}
+
+func (l StdLogger) Fatalf(format string, v ...interface{}) {
+	l.Logger.Printf("FATAL: "+format, v...)
+}
+
+func (l StdLogger) Errorf(format string, v ...interface{}) {
+	l.Logger.Printf("ERROR: "+format, v...)
+}
+
+func (l StdLogger) Warnf(format string, v ...interface{}) {
+	l.Logger.Printf("WARN: "+format, v...)
+}
+
+func (l StdLogger) Infof(format string, v ...interface{}) {
+	l.Logger.Printf("INFO: "+format, v...)
+}
+
+func (l StdLogger) Debugf(format string, v ...interface{}) {
+	l.Logger.Printf("DEBUG: "+format, v...)
+}
+
+type NoopLogger struct {
+}
+
+func (l NoopLogger) Fatalf(format string, v ...interface{}) {
+}
+
+func (l NoopLogger) Errorf(format string, v ...interface{}) {
+}
+
+func (l NoopLogger) Warnf(format string, v ...interface{}) {
+}
+
+func (l NoopLogger) Infof(format string, v ...interface{}) {
+}
+
+func (l NoopLogger) Debugf(format string, v ...interface{}) {
+}

vendor/github.com/go-ping/ping/packetconn.go

@@ -0,0 +1,103 @@
+package ping
+
+import (
+	"net"
+	"runtime"
+	"time"
+
+	"golang.org/x/net/icmp"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+type packetConn interface {
+	Close() error
+	ICMPRequestType() icmp.Type
+	ReadFrom(b []byte) (n int, ttl int, src net.Addr, err error)
+	SetFlagTTL() error
+	SetReadDeadline(t time.Time) error
+	WriteTo(b []byte, dst net.Addr) (int, error)
+	SetTTL(ttl int)
+}
+
+type icmpConn struct {
+	c   *icmp.PacketConn
+	ttl int
+}
+
+func (c *icmpConn) Close() error {
+	return c.c.Close()
+}
+
+func (c *icmpConn) SetTTL(ttl int) {
+	c.ttl = ttl
+}
+
+func (c *icmpConn) SetReadDeadline(t time.Time) error {
+	return c.c.SetReadDeadline(t)
+}
+
+func (c *icmpConn) WriteTo(b []byte, dst net.Addr) (int, error) {
+	if c.c.IPv6PacketConn() != nil {
+		if err := c.c.IPv6PacketConn().SetHopLimit(c.ttl); err != nil {
+			return 0, err
+		}
+	}
+	if c.c.IPv4PacketConn() != nil {
+		if err := c.c.IPv4PacketConn().SetTTL(c.ttl); err != nil {
+			return 0, err
+		}
+	}
+
+	return c.c.WriteTo(b, dst)
+}
+
+type icmpv4Conn struct {
+	icmpConn
+}
+
+func (c *icmpv4Conn) SetFlagTTL() error {
+	err := c.c.IPv4PacketConn().SetControlMessage(ipv4.FlagTTL, true)
+	if runtime.GOOS == "windows" {
+		return nil
+	}
+	return err
+}
+
+func (c *icmpv4Conn) ReadFrom(b []byte) (int, int, net.Addr, error) {
+	ttl := -1
+	n, cm, src, err := c.c.IPv4PacketConn().ReadFrom(b)
+	if cm != nil {
+		ttl = cm.TTL
+	}
+	return n, ttl, src, err
+}
+
+func (c icmpv4Conn) ICMPRequestType() icmp.Type {
+	return ipv4.ICMPTypeEcho
+}
+
+type icmpV6Conn struct {
+	icmpConn
+}
+
+func (c *icmpV6Conn) SetFlagTTL() error {
+	err := c.c.IPv6PacketConn().SetControlMessage(ipv6.FlagHopLimit, true)
+	if runtime.GOOS == "windows" {
+		return nil
+	}
+	return err
+}
+
+func (c *icmpV6Conn) ReadFrom(b []byte) (int, int, net.Addr, error) {
+	ttl := -1
+	n, cm, src, err := c.c.IPv6PacketConn().ReadFrom(b)
+	if cm != nil {
+		ttl = cm.HopLimit
+	}
+	return n, ttl, src, err
+}
+
+func (c icmpV6Conn) ICMPRequestType() icmp.Type {
+	return ipv6.ICMPTypeEchoRequest
+}

vendor/github.com/go-ping/ping/ping.go

@@ -0,0 +1,820 @@
+// Package ping is a simple but powerful ICMP echo (ping) library.
+//
+// Here is a very simple example that sends and receives three packets:
+//
+//	pinger, err := ping.NewPinger("www.google.com")
+//	if err != nil {
+//		panic(err)
+//	}
+//	pinger.Count = 3
+//	err = pinger.Run() // blocks until finished
+//	if err != nil {
+//		panic(err)
+//	}
+//	stats := pinger.Statistics() // get send/receive/rtt stats
+//
+// Here is an example that emulates the traditional UNIX ping command:
+//
+//	pinger, err := ping.NewPinger("www.google.com")
+//	if err != nil {
+//		panic(err)
+//	}
+//	// Listen for Ctrl-C.
+//	c := make(chan os.Signal, 1)
+//	signal.Notify(c, os.Interrupt)
+//	go func() {
+//		for _ = range c {
+//			pinger.Stop()
+//		}
+//	}()
+//	pinger.OnRecv = func(pkt *ping.Packet) {
+//		fmt.Printf("%d bytes from %s: icmp_seq=%d time=%v\n",
+//			pkt.Nbytes, pkt.IPAddr, pkt.Seq, pkt.Rtt)
+//	}
+//	pinger.OnFinish = func(stats *ping.Statistics) {
+//		fmt.Printf("\n--- %s ping statistics ---\n", stats.Addr)
+//		fmt.Printf("%d packets transmitted, %d packets received, %v%% packet loss\n",
+//			stats.PacketsSent, stats.PacketsRecv, stats.PacketLoss)
+//		fmt.Printf("round-trip min/avg/max/stddev = %v/%v/%v/%v\n",
+//			stats.MinRtt, stats.AvgRtt, stats.MaxRtt, stats.StdDevRtt)
+//	}
+//	fmt.Printf("PING %s (%s):\n", pinger.Addr(), pinger.IPAddr())
+//	err = pinger.Run()
+//	if err != nil {
+//		panic(err)
+//	}
+//
+// It sends ICMP Echo Request packet(s) and waits for an Echo Reply in response.
+// If it receives a response, it calls the OnRecv callback. When it's finished,
+// it calls the OnFinish callback.
+//
+// For a full ping example, see "cmd/ping/ping.go".
+//
+package ping
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"log"
+	"math"
+	"math/rand"
+	"net"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"time"
+
+	"github.com/google/uuid"
+	"golang.org/x/net/icmp"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+	"golang.org/x/sync/errgroup"
+)
+
+const (
+	timeSliceLength  = 8
+	trackerLength    = len(uuid.UUID{})
+	protocolICMP     = 1
+	protocolIPv6ICMP = 58
+)
+
+var (
+	ipv4Proto = map[string]string{"icmp": "ip4:icmp", "udp": "udp4"}
+	ipv6Proto = map[string]string{"icmp": "ip6:ipv6-icmp", "udp": "udp6"}
+)
+
+// New returns a new Pinger struct pointer.
+func New(addr string) *Pinger {
+	r := rand.New(rand.NewSource(getSeed()))
+	firstUUID := uuid.New()
+	var firstSequence = map[uuid.UUID]map[int]struct{}{}
+	firstSequence[firstUUID] = make(map[int]struct{})
+	return &Pinger{
+		Count:      -1,
+		Interval:   time.Second,
+		RecordRtts: true,
+		Size:       timeSliceLength + trackerLength,
+		Timeout:    time.Duration(math.MaxInt64),
+
+		addr:              addr,
+		done:              make(chan interface{}),
+		id:                r.Intn(math.MaxUint16),
+		trackerUUIDs:      []uuid.UUID{firstUUID},
+		ipaddr:            nil,
+		ipv4:              false,
+		network:           "ip",
+		protocol:          "udp",
+		awaitingSequences: firstSequence,
+		TTL:               64,
+		logger:            StdLogger{Logger: log.New(log.Writer(), log.Prefix(), log.Flags())},
+	}
+}
+
+// NewPinger returns a new Pinger and resolves the address.
+func NewPinger(addr string) (*Pinger, error) {
+	p := New(addr)
+	return p, p.Resolve()
+}
+
+// Pinger represents a packet sender/receiver.
+type Pinger struct {
+	// Interval is the wait time between each packet send. Default is 1s.
+	Interval time.Duration
+
+	// Timeout specifies a timeout before ping exits, regardless of how many
+	// packets have been received.
+	Timeout time.Duration
+
+	// Count tells pinger to stop after sending (and receiving) Count echo
+	// packets. If this option is not specified, pinger will operate until
+	// interrupted.
+	Count int
+
+	// Debug runs in debug mode
+	Debug bool
+
+	// Number of packets sent
+	PacketsSent int
+
+	// Number of packets received
+	PacketsRecv int
+
+	// Number of duplicate packets received
+	PacketsRecvDuplicates int
+
+	// Round trip time statistics
+	minRtt    time.Duration
+	maxRtt    time.Duration
+	avgRtt    time.Duration
+	stdDevRtt time.Duration
+	stddevm2  time.Duration
+	statsMu   sync.RWMutex
+
+	// If true, keep a record of rtts of all received packets.
+	// Set to false to avoid memory bloat for long running pings.
+	RecordRtts bool
+
+	// rtts is all of the Rtts
+	rtts []time.Duration
+
+	// OnSetup is called when Pinger has finished setting up the listening socket
+	OnSetup func()
+
+	// OnSend is called when Pinger sends a packet
+	OnSend func(*Packet)
+
+	// OnRecv is called when Pinger receives and processes a packet
+	OnRecv func(*Packet)
+
+	// OnFinish is called when Pinger exits
+	OnFinish func(*Statistics)
+
+	// OnDuplicateRecv is called when a packet is received that has already been received.
+	OnDuplicateRecv func(*Packet)
+
+	// Size of packet being sent
+	Size int
+
+	// Tracker: Used to uniquely identify packets - Deprecated
+	Tracker uint64
+
+	// Source is the source IP address
+	Source string
+
+	// Channel and mutex used to communicate when the Pinger should stop between goroutines.
+	done chan interface{}
+	lock sync.Mutex
+
+	ipaddr *net.IPAddr
+	addr   string
+
+	// trackerUUIDs is the list of UUIDs being used for sending packets.
+	trackerUUIDs []uuid.UUID
+
+	ipv4     bool
+	id       int
+	sequence int
+	// awaitingSequences are in-flight sequence numbers we keep track of to help remove duplicate receipts
+	awaitingSequences map[uuid.UUID]map[int]struct{}
+	// network is one of "ip", "ip4", or "ip6".
+	network string
+	// protocol is "icmp" or "udp".
+	protocol string
+
+	logger Logger
+
+	TTL int
+}
+
+type packet struct {
+	bytes  []byte
+	nbytes int
+	ttl    int
+}
+
+// Packet represents a received and processed ICMP echo packet.
+type Packet struct {
+	// Rtt is the round-trip time it took to ping.
+	Rtt time.Duration
+
+	// IPAddr is the address of the host being pinged.
+	IPAddr *net.IPAddr
+
+	// Addr is the string address of the host being pinged.
+	Addr string
+
+	// NBytes is the number of bytes in the message.
+	Nbytes int
+
+	// Seq is the ICMP sequence number.
+	Seq int
+
+	// TTL is the Time To Live on the packet.
+	Ttl int
+
+	// ID is the ICMP identifier.
+	ID int
+}
+
+// Statistics represent the stats of a currently running or finished
+// pinger operation.
+type Statistics struct {
+	// PacketsRecv is the number of packets received.
+	PacketsRecv int
+
+	// PacketsSent is the number of packets sent.
+	PacketsSent int
+
+	// PacketsRecvDuplicates is the number of duplicate responses there were to a sent packet.
+	PacketsRecvDuplicates int
+
+	// PacketLoss is the percentage of packets lost.
+	PacketLoss float64
+
+	// IPAddr is the address of the host being pinged.
+	IPAddr *net.IPAddr
+
+	// Addr is the string address of the host being pinged.
+	Addr string
+
+	// Rtts is all of the round-trip times sent via this pinger.
+	Rtts []time.Duration
+
+	// MinRtt is the minimum round-trip time sent via this pinger.
+	MinRtt time.Duration
+
+	// MaxRtt is the maximum round-trip time sent via this pinger.
+	MaxRtt time.Duration
+
+	// AvgRtt is the average round-trip time sent via this pinger.
+	AvgRtt time.Duration
+
+	// StdDevRtt is the standard deviation of the round-trip times sent via
+	// this pinger.
+	StdDevRtt time.Duration
+}
+
+func (p *Pinger) updateStatistics(pkt *Packet) {
+	p.statsMu.Lock()
+	defer p.statsMu.Unlock()
+
+	p.PacketsRecv++
+	if p.RecordRtts {
+		p.rtts = append(p.rtts, pkt.Rtt)
+	}
+
+	if p.PacketsRecv == 1 || pkt.Rtt < p.minRtt {
+		p.minRtt = pkt.Rtt
+	}
+
+	if pkt.Rtt > p.maxRtt {
+		p.maxRtt = pkt.Rtt
+	}
+
+	pktCount := time.Duration(p.PacketsRecv)
+	// welford's online method for stddev
+	// https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Welford's_online_algorithm
+	delta := pkt.Rtt - p.avgRtt
+	p.avgRtt += delta / pktCount
+	delta2 := pkt.Rtt - p.avgRtt
+	p.stddevm2 += delta * delta2
+
+	p.stdDevRtt = time.Duration(math.Sqrt(float64(p.stddevm2 / pktCount)))
+}
+
+// SetIPAddr sets the ip address of the target host.
+func (p *Pinger) SetIPAddr(ipaddr *net.IPAddr) {
+	p.ipv4 = isIPv4(ipaddr.IP)
+
+	p.ipaddr = ipaddr
+	p.addr = ipaddr.String()
+}
+
+// IPAddr returns the ip address of the target host.
+func (p *Pinger) IPAddr() *net.IPAddr {
+	return p.ipaddr
+}
+
+// Resolve does the DNS lookup for the Pinger address and sets IP protocol.
+func (p *Pinger) Resolve() error {
+	if len(p.addr) == 0 {
+		return errors.New("addr cannot be empty")
+	}
+	ipaddr, err := net.ResolveIPAddr(p.network, p.addr)
+	if err != nil {
+		return err
+	}
+
+	p.ipv4 = isIPv4(ipaddr.IP)
+
+	p.ipaddr = ipaddr
+
+	return nil
+}
+
+// SetAddr resolves and sets the ip address of the target host, addr can be a
+// DNS name like "www.google.com" or IP like "127.0.0.1".
+func (p *Pinger) SetAddr(addr string) error {
+	oldAddr := p.addr
+	p.addr = addr
+	err := p.Resolve()
+	if err != nil {
+		p.addr = oldAddr
+		return err
+	}
+	return nil
+}
+
+// Addr returns the string ip address of the target host.
+func (p *Pinger) Addr() string {
+	return p.addr
+}
+
+// SetNetwork allows configuration of DNS resolution.
+// * "ip" will automatically select IPv4 or IPv6.
+// * "ip4" will select IPv4.
+// * "ip6" will select IPv6.
+func (p *Pinger) SetNetwork(n string) {
+	switch n {
+	case "ip4":
+		p.network = "ip4"
+	case "ip6":
+		p.network = "ip6"
+	default:
+		p.network = "ip"
+	}
+}
+
+// SetPrivileged sets the type of ping pinger will send.
+// false means pinger will send an "unprivileged" UDP ping.
+// true means pinger will send a "privileged" raw ICMP ping.
+// NOTE: setting to true requires that it be run with super-user privileges.
+func (p *Pinger) SetPrivileged(privileged bool) {
+	if privileged {
+		p.protocol = "icmp"
+	} else {
+		p.protocol = "udp"
+	}
+}
+
+// Privileged returns whether pinger is running in privileged mode.
+func (p *Pinger) Privileged() bool {
+	return p.protocol == "icmp"
+}
+
+// SetLogger sets the logger to be used to log events from the pinger.
+func (p *Pinger) SetLogger(logger Logger) {
+	p.logger = logger
+}
+
+// SetID sets the ICMP identifier.
+func (p *Pinger) SetID(id int) {
+	p.id = id
+}
+
+// ID returns the ICMP identifier.
+func (p *Pinger) ID() int {
+	return p.id
+}
+
+// Run runs the pinger. This is a blocking function that will exit when it's
+// done. If Count or Interval are not specified, it will run continuously until
+// it is interrupted.
+func (p *Pinger) Run() error {
+	var conn packetConn
+	var err error
+	if p.Size < timeSliceLength+trackerLength {
+		return fmt.Errorf("size %d is less than minimum required size %d", p.Size, timeSliceLength+trackerLength)
+	}
+	if p.ipaddr == nil {
+		err = p.Resolve()
+	}
+	if err != nil {
+		return err
+	}
+	if conn, err = p.listen(); err != nil {
+		return err
+	}
+	defer conn.Close()
+
+	conn.SetTTL(p.TTL)
+	return p.run(conn)
+}
+
+func (p *Pinger) run(conn packetConn) error {
+	if err := conn.SetFlagTTL(); err != nil {
+		return err
+	}
+	defer p.finish()
+
+	recv := make(chan *packet, 5)
+	defer close(recv)
+
+	if handler := p.OnSetup; handler != nil {
+		handler()
+	}
+
+	var g errgroup.Group
+
+	g.Go(func() error {
+		defer p.Stop()
+		return p.recvICMP(conn, recv)
+	})
+
+	g.Go(func() error {
+		defer p.Stop()
+		return p.runLoop(conn, recv)
+	})
+
+	return g.Wait()
+}
+
+func (p *Pinger) runLoop(
+	conn packetConn,
+	recvCh <-chan *packet,
+) error {
+	logger := p.logger
+	if logger == nil {
+		logger = NoopLogger{}
+	}
+
+	timeout := time.NewTicker(p.Timeout)
+	interval := time.NewTicker(p.Interval)
+	defer func() {
+		interval.Stop()
+		timeout.Stop()
+	}()
+
+	if err := p.sendICMP(conn); err != nil {
+		return err
+	}
+
+	for {
+		select {
+		case <-p.done:
+			return nil
+
+		case <-timeout.C:
+			return nil
+
+		case r := <-recvCh:
+			err := p.processPacket(r)
+			if err != nil {
+				// FIXME: this logs as FATAL but continues
+				logger.Fatalf("processing received packet: %s", err)
+			}
+
+		case <-interval.C:
+			if p.Count > 0 && p.PacketsSent >= p.Count {
+				interval.Stop()
+				continue
+			}
+			err := p.sendICMP(conn)
+			if err != nil {
+				// FIXME: this logs as FATAL but continues
+				logger.Fatalf("sending packet: %s", err)
+			}
+		}
+		if p.Count > 0 && p.PacketsRecv >= p.Count {
+			return nil
+		}
+	}
+}
+
+func (p *Pinger) Stop() {
+	p.lock.Lock()
+	defer p.lock.Unlock()
+
+	open := true
+	select {
+	case _, open = <-p.done:
+	default:
+	}
+
+	if open {
+		close(p.done)
+	}
+}
+
+func (p *Pinger) finish() {
+	handler := p.OnFinish
+	if handler != nil {
+		s := p.Statistics()
+		handler(s)
+	}
+}
+
+// Statistics returns the statistics of the pinger. This can be run while the
+// pinger is running or after it is finished. OnFinish calls this function to
+// get it's finished statistics.
+func (p *Pinger) Statistics() *Statistics {
+	p.statsMu.RLock()
+	defer p.statsMu.RUnlock()
+	sent := p.PacketsSent
+	loss := float64(sent-p.PacketsRecv) / float64(sent) * 100
+	s := Statistics{
+		PacketsSent:           sent,
+		PacketsRecv:           p.PacketsRecv,
+		PacketsRecvDuplicates: p.PacketsRecvDuplicates,
+		PacketLoss:            loss,
+		Rtts:                  p.rtts,
+		Addr:                  p.addr,
+		IPAddr:                p.ipaddr,
+		MaxRtt:                p.maxRtt,
+		MinRtt:                p.minRtt,
+		AvgRtt:                p.avgRtt,
+		StdDevRtt:             p.stdDevRtt,
+	}
+	return &s
+}
+
+type expBackoff struct {
+	baseDelay time.Duration
+	maxExp    int64
+	c         int64
+}
+
+func (b *expBackoff) Get() time.Duration {
+	if b.c < b.maxExp {
+		b.c++
+	}
+
+	return b.baseDelay * time.Duration(rand.Int63n(1<<b.c))
+}
+
+func newExpBackoff(baseDelay time.Duration, maxExp int64) expBackoff {
+	return expBackoff{baseDelay: baseDelay, maxExp: maxExp}
+}
+
+func (p *Pinger) recvICMP(
+	conn packetConn,
+	recv chan<- *packet,
+) error {
+	// Start by waiting for 50 µs and increase to a possible maximum of ~ 100 ms.
+	expBackoff := newExpBackoff(50*time.Microsecond, 11)
+	delay := expBackoff.Get()
+
+	for {
+		select {
+		case <-p.done:
+			return nil
+		default:
+			bytes := make([]byte, p.getMessageLength())
+			if err := conn.SetReadDeadline(time.Now().Add(delay)); err != nil {
+				return err
+			}
+			var n, ttl int
+			var err error
+			n, ttl, _, err = conn.ReadFrom(bytes)
+			if err != nil {
+				if neterr, ok := err.(*net.OpError); ok {
+					if neterr.Timeout() {
+						// Read timeout
+						delay = expBackoff.Get()
+						continue
+					}
+				}
+				return err
+			}
+
+			select {
+			case <-p.done:
+				return nil
+			case recv <- &packet{bytes: bytes, nbytes: n, ttl: ttl}:
+			}
+		}
+	}
+}
+
+// getPacketUUID scans the tracking slice for matches.
+func (p *Pinger) getPacketUUID(pkt []byte) (*uuid.UUID, error) {
+	var packetUUID uuid.UUID
+	err := packetUUID.UnmarshalBinary(pkt[timeSliceLength : timeSliceLength+trackerLength])
+	if err != nil {
+		return nil, fmt.Errorf("error decoding tracking UUID: %w", err)
+	}
+
+	for _, item := range p.trackerUUIDs {
+		if item == packetUUID {
+			return &packetUUID, nil
+		}
+	}
+	return nil, nil
+}
+
+// getCurrentTrackerUUID grabs the latest tracker UUID.
+func (p *Pinger) getCurrentTrackerUUID() uuid.UUID {
+	return p.trackerUUIDs[len(p.trackerUUIDs)-1]
+}
+
+func (p *Pinger) processPacket(recv *packet) error {
+	receivedAt := time.Now()
+	var proto int
+	if p.ipv4 {
+		proto = protocolICMP
+	} else {
+		proto = protocolIPv6ICMP
+	}
+
+	var m *icmp.Message
+	var err error
+	if m, err = icmp.ParseMessage(proto, recv.bytes); err != nil {
+		return fmt.Errorf("error parsing icmp message: %w", err)
+	}
+
+	if m.Type != ipv4.ICMPTypeEchoReply && m.Type != ipv6.ICMPTypeEchoReply {
+		// Not an echo reply, ignore it
+		return nil
+	}
+
+	inPkt := &Packet{
+		Nbytes: recv.nbytes,
+		IPAddr: p.ipaddr,
+		Addr:   p.addr,
+		Ttl:    recv.ttl,
+		ID:     p.id,
+	}
+
+	switch pkt := m.Body.(type) {
+	case *icmp.Echo:
+		if !p.matchID(pkt.ID) {
+			return nil
+		}
+
+		if len(pkt.Data) < timeSliceLength+trackerLength {
+			return fmt.Errorf("insufficient data received; got: %d %v",
+				len(pkt.Data), pkt.Data)
+		}
+
+		pktUUID, err := p.getPacketUUID(pkt.Data)
+		if err != nil || pktUUID == nil {
+			return err
+		}
+
+		timestamp := bytesToTime(pkt.Data[:timeSliceLength])
+		inPkt.Rtt = receivedAt.Sub(timestamp)
+		inPkt.Seq = pkt.Seq
+		// If we've already received this sequence, ignore it.
+		if _, inflight := p.awaitingSequences[*pktUUID][pkt.Seq]; !inflight {
+			p.PacketsRecvDuplicates++
+			if p.OnDuplicateRecv != nil {
+				p.OnDuplicateRecv(inPkt)
+			}
+			return nil
+		}
+		// remove it from the list of sequences we're waiting for so we don't get duplicates.
+		delete(p.awaitingSequences[*pktUUID], pkt.Seq)
+		p.updateStatistics(inPkt)
+	default:
+		// Very bad, not sure how this can happen
+		return fmt.Errorf("invalid ICMP echo reply; type: '%T', '%v'", pkt, pkt)
+	}
+
+	handler := p.OnRecv
+	if handler != nil {
+		handler(inPkt)
+	}
+
+	return nil
+}
+
+func (p *Pinger) sendICMP(conn packetConn) error {
+	var dst net.Addr = p.ipaddr
+	if p.protocol == "udp" {
+		dst = &net.UDPAddr{IP: p.ipaddr.IP, Zone: p.ipaddr.Zone}
+	}
+
+	currentUUID := p.getCurrentTrackerUUID()
+	uuidEncoded, err := currentUUID.MarshalBinary()
+	if err != nil {
+		return fmt.Errorf("unable to marshal UUID binary: %w", err)
+	}
+	t := append(timeToBytes(time.Now()), uuidEncoded...)
+	if remainSize := p.Size - timeSliceLength - trackerLength; remainSize > 0 {
+		t = append(t, bytes.Repeat([]byte{1}, remainSize)...)
+	}
+
+	body := &icmp.Echo{
+		ID:   p.id,
+		Seq:  p.sequence,
+		Data: t,
+	}
+
+	msg := &icmp.Message{
+		Type: conn.ICMPRequestType(),
+		Code: 0,
+		Body: body,
+	}
+
+	msgBytes, err := msg.Marshal(nil)
+	if err != nil {
+		return err
+	}
+
+	for {
+		if _, err := conn.WriteTo(msgBytes, dst); err != nil {
+			if neterr, ok := err.(*net.OpError); ok {
+				if neterr.Err == syscall.ENOBUFS {
+					continue
+				}
+			}
+			return err
+		}
+		handler := p.OnSend
+		if handler != nil {
+			outPkt := &Packet{
+				Nbytes: len(msgBytes),
+				IPAddr: p.ipaddr,
+				Addr:   p.addr,
+				Seq:    p.sequence,
+				ID:     p.id,
+			}
+			handler(outPkt)
+		}
+		// mark this sequence as in-flight
+		p.awaitingSequences[currentUUID][p.sequence] = struct{}{}
+		p.PacketsSent++
+		p.sequence++
+		if p.sequence > 65535 {
+			newUUID := uuid.New()
+			p.trackerUUIDs = append(p.trackerUUIDs, newUUID)
+			p.awaitingSequences[newUUID] = make(map[int]struct{})
+			p.sequence = 0
+		}
+		break
+	}
+
+	return nil
+}
+
+func (p *Pinger) listen() (packetConn, error) {
+	var (
+		conn packetConn
+		err  error
+	)
+
+	if p.ipv4 {
+		var c icmpv4Conn
+		c.c, err = icmp.ListenPacket(ipv4Proto[p.protocol], p.Source)
+		conn = &c
+	} else {
+		var c icmpV6Conn
+		c.c, err = icmp.ListenPacket(ipv6Proto[p.protocol], p.Source)
+		conn = &c
+	}
+
+	if err != nil {
+		p.Stop()
+		return nil, err
+	}
+	return conn, nil
+}
+
+func bytesToTime(b []byte) time.Time {
+	var nsec int64
+	for i := uint8(0); i < 8; i++ {
+		nsec += int64(b[i]) << ((7 - i) * 8)
+	}
+	return time.Unix(nsec/1000000000, nsec%1000000000)
+}
+
+func isIPv4(ip net.IP) bool {
+	return len(ip.To4()) == net.IPv4len
+}
+
+func timeToBytes(t time.Time) []byte {
+	nsec := t.UnixNano()
+	b := make([]byte, 8)
+	for i := uint8(0); i < 8; i++ {
+		b[i] = byte((nsec >> ((7 - i) * 8)) & 0xff)
+	}
+	return b
+}
+
+var seed int64 = time.Now().UnixNano()
+
+// getSeed returns a goroutine-safe unique seed
+func getSeed() int64 {
+	return atomic.AddInt64(&seed, 1)
+}

vendor/github.com/go-ping/ping/utils_linux.go

@@ -0,0 +1,20 @@
+//go:build linux
+// +build linux
+
+package ping
+
+// Returns the length of an ICMP message.
+func (p *Pinger) getMessageLength() int {
+	return p.Size + 8
+}
+
+// Attempts to match the ID of an ICMP packet.
+func (p *Pinger) matchID(ID int) bool {
+	// On Linux we can only match ID if we are privileged.
+	if p.protocol == "icmp" {
+		if ID != p.id {
+			return false
+		}
+	}
+	return true
+}

vendor/github.com/go-ping/ping/utils_other.go

@@ -0,0 +1,17 @@
+//go:build !linux && !windows
+// +build !linux,!windows
+
+package ping
+
+// Returns the length of an ICMP message.
+func (p *Pinger) getMessageLength() int {
+	return p.Size + 8
+}
+
+// Attempts to match the ID of an ICMP packet.
+func (p *Pinger) matchID(ID int) bool {
+	if ID != p.id {
+		return false
+	}
+	return true
+}

vendor/github.com/go-ping/ping/utils_windows.go

@@ -0,0 +1,25 @@
+//go:build windows
+// +build windows
+
+package ping
+
+import (
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+// Returns the length of an ICMP message, plus the IP packet header.
+func (p *Pinger) getMessageLength() int {
+	if p.ipv4 {
+		return p.Size + 8 + ipv4.HeaderLen
+	}
+	return p.Size + 8 + ipv6.HeaderLen
+}
+
+// Attempts to match the ID of an ICMP packet.
+func (p *Pinger) matchID(ID int) bool {
+	if ID != p.id {
+		return false
+	}
+	return true
+}

vendor/golang.org/x/net/bpf/asm.go

@@ -0,0 +1,41 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import "fmt"
+
+// Assemble converts insts into raw instructions suitable for loading
+// into a BPF virtual machine.
+//
+// Currently, no optimization is attempted, the assembled program flow
+// is exactly as provided.
+func Assemble(insts []Instruction) ([]RawInstruction, error) {
+	ret := make([]RawInstruction, len(insts))
+	var err error
+	for i, inst := range insts {
+		ret[i], err = inst.Assemble()
+		if err != nil {
+			return nil, fmt.Errorf("assembling instruction %d: %s", i+1, err)
+		}
+	}
+	return ret, nil
+}
+
+// Disassemble attempts to parse raw back into
+// Instructions. Unrecognized RawInstructions are assumed to be an
+// extension not implemented by this package, and are passed through
+// unchanged to the output. The allDecoded value reports whether insts
+// contains no RawInstructions.
+func Disassemble(raw []RawInstruction) (insts []Instruction, allDecoded bool) {
+	insts = make([]Instruction, len(raw))
+	allDecoded = true
+	for i, r := range raw {
+		insts[i] = r.Disassemble()
+		if _, ok := insts[i].(RawInstruction); ok {
+			allDecoded = false
+		}
+	}
+	return insts, allDecoded
+}

vendor/golang.org/x/net/bpf/constants.go

@@ -0,0 +1,222 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+// A Register is a register of the BPF virtual machine.
+type Register uint16
+
+const (
+	// RegA is the accumulator register. RegA is always the
+	// destination register of ALU operations.
+	RegA Register = iota
+	// RegX is the indirection register, used by LoadIndirect
+	// operations.
+	RegX
+)
+
+// An ALUOp is an arithmetic or logic operation.
+type ALUOp uint16
+
+// ALU binary operation types.
+const (
+	ALUOpAdd ALUOp = iota << 4
+	ALUOpSub
+	ALUOpMul
+	ALUOpDiv
+	ALUOpOr
+	ALUOpAnd
+	ALUOpShiftLeft
+	ALUOpShiftRight
+	aluOpNeg // Not exported because it's the only unary ALU operation, and gets its own instruction type.
+	ALUOpMod
+	ALUOpXor
+)
+
+// A JumpTest is a comparison operator used in conditional jumps.
+type JumpTest uint16
+
+// Supported operators for conditional jumps.
+// K can be RegX for JumpIfX
+const (
+	// K == A
+	JumpEqual JumpTest = iota
+	// K != A
+	JumpNotEqual
+	// K > A
+	JumpGreaterThan
+	// K < A
+	JumpLessThan
+	// K >= A
+	JumpGreaterOrEqual
+	// K <= A
+	JumpLessOrEqual
+	// K & A != 0
+	JumpBitsSet
+	// K & A == 0
+	JumpBitsNotSet
+)
+
+// An Extension is a function call provided by the kernel that
+// performs advanced operations that are expensive or impossible
+// within the BPF virtual machine.
+//
+// Extensions are only implemented by the Linux kernel.
+//
+// TODO: should we prune this list? Some of these extensions seem
+// either broken or near-impossible to use correctly, whereas other
+// (len, random, ifindex) are quite useful.
+type Extension int
+
+// Extension functions available in the Linux kernel.
+const (
+	// extOffset is the negative maximum number of instructions used
+	// to load instructions by overloading the K argument.
+	extOffset = -0x1000
+	// ExtLen returns the length of the packet.
+	ExtLen Extension = 1
+	// ExtProto returns the packet's L3 protocol type.
+	ExtProto Extension = 0
+	// ExtType returns the packet's type (skb->pkt_type in the kernel)
+	//
+	// TODO: better documentation. How nice an API do we want to
+	// provide for these esoteric extensions?
+	ExtType Extension = 4
+	// ExtPayloadOffset returns the offset of the packet payload, or
+	// the first protocol header that the kernel does not know how to
+	// parse.
+	ExtPayloadOffset Extension = 52
+	// ExtInterfaceIndex returns the index of the interface on which
+	// the packet was received.
+	ExtInterfaceIndex Extension = 8
+	// ExtNetlinkAttr returns the netlink attribute of type X at
+	// offset A.
+	ExtNetlinkAttr Extension = 12
+	// ExtNetlinkAttrNested returns the nested netlink attribute of
+	// type X at offset A.
+	ExtNetlinkAttrNested Extension = 16
+	// ExtMark returns the packet's mark value.
+	ExtMark Extension = 20
+	// ExtQueue returns the packet's assigned hardware queue.
+	ExtQueue Extension = 24
+	// ExtLinkLayerType returns the packet's hardware address type
+	// (e.g. Ethernet, Infiniband).
+	ExtLinkLayerType Extension = 28
+	// ExtRXHash returns the packets receive hash.
+	//
+	// TODO: figure out what this rxhash actually is.
+	ExtRXHash Extension = 32
+	// ExtCPUID returns the ID of the CPU processing the current
+	// packet.
+	ExtCPUID Extension = 36
+	// ExtVLANTag returns the packet's VLAN tag.
+	ExtVLANTag Extension = 44
+	// ExtVLANTagPresent returns non-zero if the packet has a VLAN
+	// tag.
+	//
+	// TODO: I think this might be a lie: it reads bit 0x1000 of the
+	// VLAN header, which changed meaning in recent revisions of the
+	// spec - this extension may now return meaningless information.
+	ExtVLANTagPresent Extension = 48
+	// ExtVLANProto returns 0x8100 if the frame has a VLAN header,
+	// 0x88a8 if the frame has a "Q-in-Q" double VLAN header, or some
+	// other value if no VLAN information is present.
+	ExtVLANProto Extension = 60
+	// ExtRand returns a uniformly random uint32.
+	ExtRand Extension = 56
+)
+
+// The following gives names to various bit patterns used in opcode construction.
+
+const (
+	opMaskCls uint16 = 0x7
+	// opClsLoad masks
+	opMaskLoadDest  = 0x01
+	opMaskLoadWidth = 0x18
+	opMaskLoadMode  = 0xe0
+	// opClsALU & opClsJump
+	opMaskOperand  = 0x08
+	opMaskOperator = 0xf0
+)
+
+const (
+	// +---------------+-----------------+---+---+---+
+	// | AddrMode (3b) | LoadWidth (2b)  | 0 | 0 | 0 |
+	// +---------------+-----------------+---+---+---+
+	opClsLoadA uint16 = iota
+	// +---------------+-----------------+---+---+---+
+	// | AddrMode (3b) | LoadWidth (2b)  | 0 | 0 | 1 |
+	// +---------------+-----------------+---+---+---+
+	opClsLoadX
+	// +---+---+---+---+---+---+---+---+
+	// | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 |
+	// +---+---+---+---+---+---+---+---+
+	opClsStoreA
+	// +---+---+---+---+---+---+---+---+
+	// | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
+	// +---+---+---+---+---+---+---+---+
+	opClsStoreX
+	// +---------------+-----------------+---+---+---+
+	// | Operator (4b) | OperandSrc (1b) | 1 | 0 | 0 |
+	// +---------------+-----------------+---+---+---+
+	opClsALU
+	// +-----------------------------+---+---+---+---+
+	// |      TestOperator (4b)      | 0 | 1 | 0 | 1 |
+	// +-----------------------------+---+---+---+---+
+	opClsJump
+	// +---+-------------------------+---+---+---+---+
+	// | 0 | 0 | 0 |   RetSrc (1b)   | 0 | 1 | 1 | 0 |
+	// +---+-------------------------+---+---+---+---+
+	opClsReturn
+	// +---+-------------------------+---+---+---+---+
+	// | 0 | 0 | 0 |  TXAorTAX (1b)  | 0 | 1 | 1 | 1 |
+	// +---+-------------------------+---+---+---+---+
+	opClsMisc
+)
+
+const (
+	opAddrModeImmediate uint16 = iota << 5
+	opAddrModeAbsolute
+	opAddrModeIndirect
+	opAddrModeScratch
+	opAddrModePacketLen // actually an extension, not an addressing mode.
+	opAddrModeMemShift
+)
+
+const (
+	opLoadWidth4 uint16 = iota << 3
+	opLoadWidth2
+	opLoadWidth1
+)
+
+// Operand for ALU and Jump instructions
+type opOperand uint16
+
+// Supported operand sources.
+const (
+	opOperandConstant opOperand = iota << 3
+	opOperandX
+)
+
+// An jumpOp is a conditional jump condition.
+type jumpOp uint16
+
+// Supported jump conditions.
+const (
+	opJumpAlways jumpOp = iota << 4
+	opJumpEqual
+	opJumpGT
+	opJumpGE
+	opJumpSet
+)
+
+const (
+	opRetSrcConstant uint16 = iota << 4
+	opRetSrcA
+)
+
+const (
+	opMiscTAX = 0x00
+	opMiscTXA = 0x80
+)

vendor/golang.org/x/net/bpf/doc.go

@@ -0,0 +1,80 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package bpf implements marshaling and unmarshaling of programs for the
+Berkeley Packet Filter virtual machine, and provides a Go implementation
+of the virtual machine.
+
+BPF's main use is to specify a packet filter for network taps, so that
+the kernel doesn't have to expensively copy every packet it sees to
+userspace. However, it's been repurposed to other areas where running
+user code in-kernel is needed. For example, Linux's seccomp uses BPF
+to apply security policies to system calls. For simplicity, this
+documentation refers only to packets, but other uses of BPF have their
+own data payloads.
+
+BPF programs run in a restricted virtual machine. It has almost no
+access to kernel functions, and while conditional branches are
+allowed, they can only jump forwards, to guarantee that there are no
+infinite loops.
+
+# The virtual machine
+
+The BPF VM is an accumulator machine. Its main register, called
+register A, is an implicit source and destination in all arithmetic
+and logic operations. The machine also has 16 scratch registers for
+temporary storage, and an indirection register (register X) for
+indirect memory access. All registers are 32 bits wide.
+
+Each run of a BPF program is given one packet, which is placed in the
+VM's read-only "main memory". LoadAbsolute and LoadIndirect
+instructions can fetch up to 32 bits at a time into register A for
+examination.
+
+The goal of a BPF program is to produce and return a verdict (uint32),
+which tells the kernel what to do with the packet. In the context of
+packet filtering, the returned value is the number of bytes of the
+packet to forward to userspace, or 0 to ignore the packet. Other
+contexts like seccomp define their own return values.
+
+In order to simplify programs, attempts to read past the end of the
+packet terminate the program execution with a verdict of 0 (ignore
+packet). This means that the vast majority of BPF programs don't need
+to do any explicit bounds checking.
+
+In addition to the bytes of the packet, some BPF programs have access
+to extensions, which are essentially calls to kernel utility
+functions. Currently, the only extensions supported by this package
+are the Linux packet filter extensions.
+
+# Examples
+
+This packet filter selects all ARP packets.
+
+	bpf.Assemble([]bpf.Instruction{
+		// Load "EtherType" field from the ethernet header.
+		bpf.LoadAbsolute{Off: 12, Size: 2},
+		// Skip over the next instruction if EtherType is not ARP.
+		bpf.JumpIf{Cond: bpf.JumpNotEqual, Val: 0x0806, SkipTrue: 1},
+		// Verdict is "send up to 4k of the packet to userspace."
+		bpf.RetConstant{Val: 4096},
+		// Verdict is "ignore packet."
+		bpf.RetConstant{Val: 0},
+	})
+
+This packet filter captures a random 1% sample of traffic.
+
+	bpf.Assemble([]bpf.Instruction{
+		// Get a 32-bit random number from the Linux kernel.
+		bpf.LoadExtension{Num: bpf.ExtRand},
+		// 1% dice roll?
+		bpf.JumpIf{Cond: bpf.JumpLessThan, Val: 2^32/100, SkipFalse: 1},
+		// Capture.
+		bpf.RetConstant{Val: 4096},
+		// Ignore.
+		bpf.RetConstant{Val: 0},
+	})
+*/
+package bpf // import "golang.org/x/net/bpf"

vendor/golang.org/x/net/bpf/instructions.go

@@ -0,0 +1,726 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import "fmt"
+
+// An Instruction is one instruction executed by the BPF virtual
+// machine.
+type Instruction interface {
+	// Assemble assembles the Instruction into a RawInstruction.
+	Assemble() (RawInstruction, error)
+}
+
+// A RawInstruction is a raw BPF virtual machine instruction.
+type RawInstruction struct {
+	// Operation to execute.
+	Op uint16
+	// For conditional jump instructions, the number of instructions
+	// to skip if the condition is true/false.
+	Jt uint8
+	Jf uint8
+	// Constant parameter. The meaning depends on the Op.
+	K uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (ri RawInstruction) Assemble() (RawInstruction, error) { return ri, nil }
+
+// Disassemble parses ri into an Instruction and returns it. If ri is
+// not recognized by this package, ri itself is returned.
+func (ri RawInstruction) Disassemble() Instruction {
+	switch ri.Op & opMaskCls {
+	case opClsLoadA, opClsLoadX:
+		reg := Register(ri.Op & opMaskLoadDest)
+		sz := 0
+		switch ri.Op & opMaskLoadWidth {
+		case opLoadWidth4:
+			sz = 4
+		case opLoadWidth2:
+			sz = 2
+		case opLoadWidth1:
+			sz = 1
+		default:
+			return ri
+		}
+		switch ri.Op & opMaskLoadMode {
+		case opAddrModeImmediate:
+			if sz != 4 {
+				return ri
+			}
+			return LoadConstant{Dst: reg, Val: ri.K}
+		case opAddrModeScratch:
+			if sz != 4 || ri.K > 15 {
+				return ri
+			}
+			return LoadScratch{Dst: reg, N: int(ri.K)}
+		case opAddrModeAbsolute:
+			if ri.K > extOffset+0xffffffff {
+				return LoadExtension{Num: Extension(-extOffset + ri.K)}
+			}
+			return LoadAbsolute{Size: sz, Off: ri.K}
+		case opAddrModeIndirect:
+			return LoadIndirect{Size: sz, Off: ri.K}
+		case opAddrModePacketLen:
+			if sz != 4 {
+				return ri
+			}
+			return LoadExtension{Num: ExtLen}
+		case opAddrModeMemShift:
+			return LoadMemShift{Off: ri.K}
+		default:
+			return ri
+		}
+
+	case opClsStoreA:
+		if ri.Op != opClsStoreA || ri.K > 15 {
+			return ri
+		}
+		return StoreScratch{Src: RegA, N: int(ri.K)}
+
+	case opClsStoreX:
+		if ri.Op != opClsStoreX || ri.K > 15 {
+			return ri
+		}
+		return StoreScratch{Src: RegX, N: int(ri.K)}
+
+	case opClsALU:
+		switch op := ALUOp(ri.Op & opMaskOperator); op {
+		case ALUOpAdd, ALUOpSub, ALUOpMul, ALUOpDiv, ALUOpOr, ALUOpAnd, ALUOpShiftLeft, ALUOpShiftRight, ALUOpMod, ALUOpXor:
+			switch operand := opOperand(ri.Op & opMaskOperand); operand {
+			case opOperandX:
+				return ALUOpX{Op: op}
+			case opOperandConstant:
+				return ALUOpConstant{Op: op, Val: ri.K}
+			default:
+				return ri
+			}
+		case aluOpNeg:
+			return NegateA{}
+		default:
+			return ri
+		}
+
+	case opClsJump:
+		switch op := jumpOp(ri.Op & opMaskOperator); op {
+		case opJumpAlways:
+			return Jump{Skip: ri.K}
+		case opJumpEqual, opJumpGT, opJumpGE, opJumpSet:
+			cond, skipTrue, skipFalse := jumpOpToTest(op, ri.Jt, ri.Jf)
+			switch operand := opOperand(ri.Op & opMaskOperand); operand {
+			case opOperandX:
+				return JumpIfX{Cond: cond, SkipTrue: skipTrue, SkipFalse: skipFalse}
+			case opOperandConstant:
+				return JumpIf{Cond: cond, Val: ri.K, SkipTrue: skipTrue, SkipFalse: skipFalse}
+			default:
+				return ri
+			}
+		default:
+			return ri
+		}
+
+	case opClsReturn:
+		switch ri.Op {
+		case opClsReturn | opRetSrcA:
+			return RetA{}
+		case opClsReturn | opRetSrcConstant:
+			return RetConstant{Val: ri.K}
+		default:
+			return ri
+		}
+
+	case opClsMisc:
+		switch ri.Op {
+		case opClsMisc | opMiscTAX:
+			return TAX{}
+		case opClsMisc | opMiscTXA:
+			return TXA{}
+		default:
+			return ri
+		}
+
+	default:
+		panic("unreachable") // switch is exhaustive on the bit pattern
+	}
+}
+
+func jumpOpToTest(op jumpOp, skipTrue uint8, skipFalse uint8) (JumpTest, uint8, uint8) {
+	var test JumpTest
+
+	// Decode "fake" jump conditions that don't appear in machine code
+	// Ensures the Assemble -> Disassemble stage recreates the same instructions
+	// See https://github.com/golang/go/issues/18470
+	if skipTrue == 0 {
+		switch op {
+		case opJumpEqual:
+			test = JumpNotEqual
+		case opJumpGT:
+			test = JumpLessOrEqual
+		case opJumpGE:
+			test = JumpLessThan
+		case opJumpSet:
+			test = JumpBitsNotSet
+		}
+
+		return test, skipFalse, 0
+	}
+
+	switch op {
+	case opJumpEqual:
+		test = JumpEqual
+	case opJumpGT:
+		test = JumpGreaterThan
+	case opJumpGE:
+		test = JumpGreaterOrEqual
+	case opJumpSet:
+		test = JumpBitsSet
+	}
+
+	return test, skipTrue, skipFalse
+}
+
+// LoadConstant loads Val into register Dst.
+type LoadConstant struct {
+	Dst Register
+	Val uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadConstant) Assemble() (RawInstruction, error) {
+	return assembleLoad(a.Dst, 4, opAddrModeImmediate, a.Val)
+}
+
+// String returns the instruction in assembler notation.
+func (a LoadConstant) String() string {
+	switch a.Dst {
+	case RegA:
+		return fmt.Sprintf("ld #%d", a.Val)
+	case RegX:
+		return fmt.Sprintf("ldx #%d", a.Val)
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// LoadScratch loads scratch[N] into register Dst.
+type LoadScratch struct {
+	Dst Register
+	N   int // 0-15
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadScratch) Assemble() (RawInstruction, error) {
+	if a.N < 0 || a.N > 15 {
+		return RawInstruction{}, fmt.Errorf("invalid scratch slot %d", a.N)
+	}
+	return assembleLoad(a.Dst, 4, opAddrModeScratch, uint32(a.N))
+}
+
+// String returns the instruction in assembler notation.
+func (a LoadScratch) String() string {
+	switch a.Dst {
+	case RegA:
+		return fmt.Sprintf("ld M[%d]", a.N)
+	case RegX:
+		return fmt.Sprintf("ldx M[%d]", a.N)
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// LoadAbsolute loads packet[Off:Off+Size] as an integer value into
+// register A.
+type LoadAbsolute struct {
+	Off  uint32
+	Size int // 1, 2 or 4
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadAbsolute) Assemble() (RawInstruction, error) {
+	return assembleLoad(RegA, a.Size, opAddrModeAbsolute, a.Off)
+}
+
+// String returns the instruction in assembler notation.
+func (a LoadAbsolute) String() string {
+	switch a.Size {
+	case 1: // byte
+		return fmt.Sprintf("ldb [%d]", a.Off)
+	case 2: // half word
+		return fmt.Sprintf("ldh [%d]", a.Off)
+	case 4: // word
+		if a.Off > extOffset+0xffffffff {
+			return LoadExtension{Num: Extension(a.Off + 0x1000)}.String()
+		}
+		return fmt.Sprintf("ld [%d]", a.Off)
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// LoadIndirect loads packet[X+Off:X+Off+Size] as an integer value
+// into register A.
+type LoadIndirect struct {
+	Off  uint32
+	Size int // 1, 2 or 4
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadIndirect) Assemble() (RawInstruction, error) {
+	return assembleLoad(RegA, a.Size, opAddrModeIndirect, a.Off)
+}
+
+// String returns the instruction in assembler notation.
+func (a LoadIndirect) String() string {
+	switch a.Size {
+	case 1: // byte
+		return fmt.Sprintf("ldb [x + %d]", a.Off)
+	case 2: // half word
+		return fmt.Sprintf("ldh [x + %d]", a.Off)
+	case 4: // word
+		return fmt.Sprintf("ld [x + %d]", a.Off)
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// LoadMemShift multiplies the first 4 bits of the byte at packet[Off]
+// by 4 and stores the result in register X.
+//
+// This instruction is mainly useful to load into X the length of an
+// IPv4 packet header in a single instruction, rather than have to do
+// the arithmetic on the header's first byte by hand.
+type LoadMemShift struct {
+	Off uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadMemShift) Assemble() (RawInstruction, error) {
+	return assembleLoad(RegX, 1, opAddrModeMemShift, a.Off)
+}
+
+// String returns the instruction in assembler notation.
+func (a LoadMemShift) String() string {
+	return fmt.Sprintf("ldx 4*([%d]&0xf)", a.Off)
+}
+
+// LoadExtension invokes a linux-specific extension and stores the
+// result in register A.
+type LoadExtension struct {
+	Num Extension
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a LoadExtension) Assemble() (RawInstruction, error) {
+	if a.Num == ExtLen {
+		return assembleLoad(RegA, 4, opAddrModePacketLen, 0)
+	}
+	return assembleLoad(RegA, 4, opAddrModeAbsolute, uint32(extOffset+a.Num))
+}
+
+// String returns the instruction in assembler notation.
+func (a LoadExtension) String() string {
+	switch a.Num {
+	case ExtLen:
+		return "ld #len"
+	case ExtProto:
+		return "ld #proto"
+	case ExtType:
+		return "ld #type"
+	case ExtPayloadOffset:
+		return "ld #poff"
+	case ExtInterfaceIndex:
+		return "ld #ifidx"
+	case ExtNetlinkAttr:
+		return "ld #nla"
+	case ExtNetlinkAttrNested:
+		return "ld #nlan"
+	case ExtMark:
+		return "ld #mark"
+	case ExtQueue:
+		return "ld #queue"
+	case ExtLinkLayerType:
+		return "ld #hatype"
+	case ExtRXHash:
+		return "ld #rxhash"
+	case ExtCPUID:
+		return "ld #cpu"
+	case ExtVLANTag:
+		return "ld #vlan_tci"
+	case ExtVLANTagPresent:
+		return "ld #vlan_avail"
+	case ExtVLANProto:
+		return "ld #vlan_tpid"
+	case ExtRand:
+		return "ld #rand"
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// StoreScratch stores register Src into scratch[N].
+type StoreScratch struct {
+	Src Register
+	N   int // 0-15
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a StoreScratch) Assemble() (RawInstruction, error) {
+	if a.N < 0 || a.N > 15 {
+		return RawInstruction{}, fmt.Errorf("invalid scratch slot %d", a.N)
+	}
+	var op uint16
+	switch a.Src {
+	case RegA:
+		op = opClsStoreA
+	case RegX:
+		op = opClsStoreX
+	default:
+		return RawInstruction{}, fmt.Errorf("invalid source register %v", a.Src)
+	}
+
+	return RawInstruction{
+		Op: op,
+		K:  uint32(a.N),
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a StoreScratch) String() string {
+	switch a.Src {
+	case RegA:
+		return fmt.Sprintf("st M[%d]", a.N)
+	case RegX:
+		return fmt.Sprintf("stx M[%d]", a.N)
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// ALUOpConstant executes A = A <Op> Val.
+type ALUOpConstant struct {
+	Op  ALUOp
+	Val uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a ALUOpConstant) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsALU | uint16(opOperandConstant) | uint16(a.Op),
+		K:  a.Val,
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a ALUOpConstant) String() string {
+	switch a.Op {
+	case ALUOpAdd:
+		return fmt.Sprintf("add #%d", a.Val)
+	case ALUOpSub:
+		return fmt.Sprintf("sub #%d", a.Val)
+	case ALUOpMul:
+		return fmt.Sprintf("mul #%d", a.Val)
+	case ALUOpDiv:
+		return fmt.Sprintf("div #%d", a.Val)
+	case ALUOpMod:
+		return fmt.Sprintf("mod #%d", a.Val)
+	case ALUOpAnd:
+		return fmt.Sprintf("and #%d", a.Val)
+	case ALUOpOr:
+		return fmt.Sprintf("or #%d", a.Val)
+	case ALUOpXor:
+		return fmt.Sprintf("xor #%d", a.Val)
+	case ALUOpShiftLeft:
+		return fmt.Sprintf("lsh #%d", a.Val)
+	case ALUOpShiftRight:
+		return fmt.Sprintf("rsh #%d", a.Val)
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// ALUOpX executes A = A <Op> X
+type ALUOpX struct {
+	Op ALUOp
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a ALUOpX) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsALU | uint16(opOperandX) | uint16(a.Op),
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a ALUOpX) String() string {
+	switch a.Op {
+	case ALUOpAdd:
+		return "add x"
+	case ALUOpSub:
+		return "sub x"
+	case ALUOpMul:
+		return "mul x"
+	case ALUOpDiv:
+		return "div x"
+	case ALUOpMod:
+		return "mod x"
+	case ALUOpAnd:
+		return "and x"
+	case ALUOpOr:
+		return "or x"
+	case ALUOpXor:
+		return "xor x"
+	case ALUOpShiftLeft:
+		return "lsh x"
+	case ALUOpShiftRight:
+		return "rsh x"
+	default:
+		return fmt.Sprintf("unknown instruction: %#v", a)
+	}
+}
+
+// NegateA executes A = -A.
+type NegateA struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a NegateA) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsALU | uint16(aluOpNeg),
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a NegateA) String() string {
+	return fmt.Sprintf("neg")
+}
+
+// Jump skips the following Skip instructions in the program.
+type Jump struct {
+	Skip uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a Jump) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsJump | uint16(opJumpAlways),
+		K:  a.Skip,
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a Jump) String() string {
+	return fmt.Sprintf("ja %d", a.Skip)
+}
+
+// JumpIf skips the following Skip instructions in the program if A
+// <Cond> Val is true.
+type JumpIf struct {
+	Cond      JumpTest
+	Val       uint32
+	SkipTrue  uint8
+	SkipFalse uint8
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a JumpIf) Assemble() (RawInstruction, error) {
+	return jumpToRaw(a.Cond, opOperandConstant, a.Val, a.SkipTrue, a.SkipFalse)
+}
+
+// String returns the instruction in assembler notation.
+func (a JumpIf) String() string {
+	return jumpToString(a.Cond, fmt.Sprintf("#%d", a.Val), a.SkipTrue, a.SkipFalse)
+}
+
+// JumpIfX skips the following Skip instructions in the program if A
+// <Cond> X is true.
+type JumpIfX struct {
+	Cond      JumpTest
+	SkipTrue  uint8
+	SkipFalse uint8
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a JumpIfX) Assemble() (RawInstruction, error) {
+	return jumpToRaw(a.Cond, opOperandX, 0, a.SkipTrue, a.SkipFalse)
+}
+
+// String returns the instruction in assembler notation.
+func (a JumpIfX) String() string {
+	return jumpToString(a.Cond, "x", a.SkipTrue, a.SkipFalse)
+}
+
+// jumpToRaw assembles a jump instruction into a RawInstruction
+func jumpToRaw(test JumpTest, operand opOperand, k uint32, skipTrue, skipFalse uint8) (RawInstruction, error) {
+	var (
+		cond jumpOp
+		flip bool
+	)
+	switch test {
+	case JumpEqual:
+		cond = opJumpEqual
+	case JumpNotEqual:
+		cond, flip = opJumpEqual, true
+	case JumpGreaterThan:
+		cond = opJumpGT
+	case JumpLessThan:
+		cond, flip = opJumpGE, true
+	case JumpGreaterOrEqual:
+		cond = opJumpGE
+	case JumpLessOrEqual:
+		cond, flip = opJumpGT, true
+	case JumpBitsSet:
+		cond = opJumpSet
+	case JumpBitsNotSet:
+		cond, flip = opJumpSet, true
+	default:
+		return RawInstruction{}, fmt.Errorf("unknown JumpTest %v", test)
+	}
+	jt, jf := skipTrue, skipFalse
+	if flip {
+		jt, jf = jf, jt
+	}
+	return RawInstruction{
+		Op: opClsJump | uint16(cond) | uint16(operand),
+		Jt: jt,
+		Jf: jf,
+		K:  k,
+	}, nil
+}
+
+// jumpToString converts a jump instruction to assembler notation
+func jumpToString(cond JumpTest, operand string, skipTrue, skipFalse uint8) string {
+	switch cond {
+	// K == A
+	case JumpEqual:
+		return conditionalJump(operand, skipTrue, skipFalse, "jeq", "jneq")
+	// K != A
+	case JumpNotEqual:
+		return fmt.Sprintf("jneq %s,%d", operand, skipTrue)
+	// K > A
+	case JumpGreaterThan:
+		return conditionalJump(operand, skipTrue, skipFalse, "jgt", "jle")
+	// K < A
+	case JumpLessThan:
+		return fmt.Sprintf("jlt %s,%d", operand, skipTrue)
+	// K >= A
+	case JumpGreaterOrEqual:
+		return conditionalJump(operand, skipTrue, skipFalse, "jge", "jlt")
+	// K <= A
+	case JumpLessOrEqual:
+		return fmt.Sprintf("jle %s,%d", operand, skipTrue)
+	// K & A != 0
+	case JumpBitsSet:
+		if skipFalse > 0 {
+			return fmt.Sprintf("jset %s,%d,%d", operand, skipTrue, skipFalse)
+		}
+		return fmt.Sprintf("jset %s,%d", operand, skipTrue)
+	// K & A == 0, there is no assembler instruction for JumpBitNotSet, use JumpBitSet and invert skips
+	case JumpBitsNotSet:
+		return jumpToString(JumpBitsSet, operand, skipFalse, skipTrue)
+	default:
+		return fmt.Sprintf("unknown JumpTest %#v", cond)
+	}
+}
+
+func conditionalJump(operand string, skipTrue, skipFalse uint8, positiveJump, negativeJump string) string {
+	if skipTrue > 0 {
+		if skipFalse > 0 {
+			return fmt.Sprintf("%s %s,%d,%d", positiveJump, operand, skipTrue, skipFalse)
+		}
+		return fmt.Sprintf("%s %s,%d", positiveJump, operand, skipTrue)
+	}
+	return fmt.Sprintf("%s %s,%d", negativeJump, operand, skipFalse)
+}
+
+// RetA exits the BPF program, returning the value of register A.
+type RetA struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a RetA) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsReturn | opRetSrcA,
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a RetA) String() string {
+	return fmt.Sprintf("ret a")
+}
+
+// RetConstant exits the BPF program, returning a constant value.
+type RetConstant struct {
+	Val uint32
+}
+
+// Assemble implements the Instruction Assemble method.
+func (a RetConstant) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsReturn | opRetSrcConstant,
+		K:  a.Val,
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a RetConstant) String() string {
+	return fmt.Sprintf("ret #%d", a.Val)
+}
+
+// TXA copies the value of register X to register A.
+type TXA struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a TXA) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsMisc | opMiscTXA,
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a TXA) String() string {
+	return fmt.Sprintf("txa")
+}
+
+// TAX copies the value of register A to register X.
+type TAX struct{}
+
+// Assemble implements the Instruction Assemble method.
+func (a TAX) Assemble() (RawInstruction, error) {
+	return RawInstruction{
+		Op: opClsMisc | opMiscTAX,
+	}, nil
+}
+
+// String returns the instruction in assembler notation.
+func (a TAX) String() string {
+	return fmt.Sprintf("tax")
+}
+
+func assembleLoad(dst Register, loadSize int, mode uint16, k uint32) (RawInstruction, error) {
+	var (
+		cls uint16
+		sz  uint16
+	)
+	switch dst {
+	case RegA:
+		cls = opClsLoadA
+	case RegX:
+		cls = opClsLoadX
+	default:
+		return RawInstruction{}, fmt.Errorf("invalid target register %v", dst)
+	}
+	switch loadSize {
+	case 1:
+		sz = opLoadWidth1
+	case 2:
+		sz = opLoadWidth2
+	case 4:
+		sz = opLoadWidth4
+	default:
+		return RawInstruction{}, fmt.Errorf("invalid load byte length %d", sz)
+	}
+	return RawInstruction{
+		Op: cls | sz | mode,
+		K:  k,
+	}, nil
+}

vendor/golang.org/x/net/bpf/setter.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+// A Setter is a type which can attach a compiled BPF filter to itself.
+type Setter interface {
+	SetBPF(filter []RawInstruction) error
+}

vendor/golang.org/x/net/bpf/vm.go

@@ -0,0 +1,150 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import (
+	"errors"
+	"fmt"
+)
+
+// A VM is an emulated BPF virtual machine.
+type VM struct {
+	filter []Instruction
+}
+
+// NewVM returns a new VM using the input BPF program.
+func NewVM(filter []Instruction) (*VM, error) {
+	if len(filter) == 0 {
+		return nil, errors.New("one or more Instructions must be specified")
+	}
+
+	for i, ins := range filter {
+		check := len(filter) - (i + 1)
+		switch ins := ins.(type) {
+		// Check for out-of-bounds jumps in instructions
+		case Jump:
+			if check <= int(ins.Skip) {
+				return nil, fmt.Errorf("cannot jump %d instructions; jumping past program bounds", ins.Skip)
+			}
+		case JumpIf:
+			if check <= int(ins.SkipTrue) {
+				return nil, fmt.Errorf("cannot jump %d instructions in true case; jumping past program bounds", ins.SkipTrue)
+			}
+			if check <= int(ins.SkipFalse) {
+				return nil, fmt.Errorf("cannot jump %d instructions in false case; jumping past program bounds", ins.SkipFalse)
+			}
+		case JumpIfX:
+			if check <= int(ins.SkipTrue) {
+				return nil, fmt.Errorf("cannot jump %d instructions in true case; jumping past program bounds", ins.SkipTrue)
+			}
+			if check <= int(ins.SkipFalse) {
+				return nil, fmt.Errorf("cannot jump %d instructions in false case; jumping past program bounds", ins.SkipFalse)
+			}
+		// Check for division or modulus by zero
+		case ALUOpConstant:
+			if ins.Val != 0 {
+				break
+			}
+
+			switch ins.Op {
+			case ALUOpDiv, ALUOpMod:
+				return nil, errors.New("cannot divide by zero using ALUOpConstant")
+			}
+		// Check for unknown extensions
+		case LoadExtension:
+			switch ins.Num {
+			case ExtLen:
+			default:
+				return nil, fmt.Errorf("extension %d not implemented", ins.Num)
+			}
+		}
+	}
+
+	// Make sure last instruction is a return instruction
+	switch filter[len(filter)-1].(type) {
+	case RetA, RetConstant:
+	default:
+		return nil, errors.New("BPF program must end with RetA or RetConstant")
+	}
+
+	// Though our VM works using disassembled instructions, we
+	// attempt to assemble the input filter anyway to ensure it is compatible
+	// with an operating system VM.
+	_, err := Assemble(filter)
+
+	return &VM{
+		filter: filter,
+	}, err
+}
+
+// Run runs the VM's BPF program against the input bytes.
+// Run returns the number of bytes accepted by the BPF program, and any errors
+// which occurred while processing the program.
+func (v *VM) Run(in []byte) (int, error) {
+	var (
+		// Registers of the virtual machine
+		regA       uint32
+		regX       uint32
+		regScratch [16]uint32
+
+		// OK is true if the program should continue processing the next
+		// instruction, or false if not, causing the loop to break
+		ok = true
+	)
+
+	// TODO(mdlayher): implement:
+	// - NegateA:
+	//   - would require a change from uint32 registers to int32
+	//     registers
+
+	// TODO(mdlayher): add interop tests that check signedness of ALU
+	// operations against kernel implementation, and make sure Go
+	// implementation matches behavior
+
+	for i := 0; i < len(v.filter) && ok; i++ {
+		ins := v.filter[i]
+
+		switch ins := ins.(type) {
+		case ALUOpConstant:
+			regA = aluOpConstant(ins, regA)
+		case ALUOpX:
+			regA, ok = aluOpX(ins, regA, regX)
+		case Jump:
+			i += int(ins.Skip)
+		case JumpIf:
+			jump := jumpIf(ins, regA)
+			i += jump
+		case JumpIfX:
+			jump := jumpIfX(ins, regA, regX)
+			i += jump
+		case LoadAbsolute:
+			regA, ok = loadAbsolute(ins, in)
+		case LoadConstant:
+			regA, regX = loadConstant(ins, regA, regX)
+		case LoadExtension:
+			regA = loadExtension(ins, in)
+		case LoadIndirect:
+			regA, ok = loadIndirect(ins, in, regX)
+		case LoadMemShift:
+			regX, ok = loadMemShift(ins, in)
+		case LoadScratch:
+			regA, regX = loadScratch(ins, regScratch, regA, regX)
+		case RetA:
+			return int(regA), nil
+		case RetConstant:
+			return int(ins.Val), nil
+		case StoreScratch:
+			regScratch = storeScratch(ins, regScratch, regA, regX)
+		case TAX:
+			regX = regA
+		case TXA:
+			regA = regX
+		default:
+			return 0, fmt.Errorf("unknown Instruction at index %d: %T", i, ins)
+		}
+	}
+
+	return 0, nil
+}

vendor/golang.org/x/net/bpf/vm_instructions.go

@@ -0,0 +1,182 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package bpf
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+func aluOpConstant(ins ALUOpConstant, regA uint32) uint32 {
+	return aluOpCommon(ins.Op, regA, ins.Val)
+}
+
+func aluOpX(ins ALUOpX, regA uint32, regX uint32) (uint32, bool) {
+	// Guard against division or modulus by zero by terminating
+	// the program, as the OS BPF VM does
+	if regX == 0 {
+		switch ins.Op {
+		case ALUOpDiv, ALUOpMod:
+			return 0, false
+		}
+	}
+
+	return aluOpCommon(ins.Op, regA, regX), true
+}
+
+func aluOpCommon(op ALUOp, regA uint32, value uint32) uint32 {
+	switch op {
+	case ALUOpAdd:
+		return regA + value
+	case ALUOpSub:
+		return regA - value
+	case ALUOpMul:
+		return regA * value
+	case ALUOpDiv:
+		// Division by zero not permitted by NewVM and aluOpX checks
+		return regA / value
+	case ALUOpOr:
+		return regA | value
+	case ALUOpAnd:
+		return regA & value
+	case ALUOpShiftLeft:
+		return regA << value
+	case ALUOpShiftRight:
+		return regA >> value
+	case ALUOpMod:
+		// Modulus by zero not permitted by NewVM and aluOpX checks
+		return regA % value
+	case ALUOpXor:
+		return regA ^ value
+	default:
+		return regA
+	}
+}
+
+func jumpIf(ins JumpIf, regA uint32) int {
+	return jumpIfCommon(ins.Cond, ins.SkipTrue, ins.SkipFalse, regA, ins.Val)
+}
+
+func jumpIfX(ins JumpIfX, regA uint32, regX uint32) int {
+	return jumpIfCommon(ins.Cond, ins.SkipTrue, ins.SkipFalse, regA, regX)
+}
+
+func jumpIfCommon(cond JumpTest, skipTrue, skipFalse uint8, regA uint32, value uint32) int {
+	var ok bool
+
+	switch cond {
+	case JumpEqual:
+		ok = regA == value
+	case JumpNotEqual:
+		ok = regA != value
+	case JumpGreaterThan:
+		ok = regA > value
+	case JumpLessThan:
+		ok = regA < value
+	case JumpGreaterOrEqual:
+		ok = regA >= value
+	case JumpLessOrEqual:
+		ok = regA <= value
+	case JumpBitsSet:
+		ok = (regA & value) != 0
+	case JumpBitsNotSet:
+		ok = (regA & value) == 0
+	}
+
+	if ok {
+		return int(skipTrue)
+	}
+
+	return int(skipFalse)
+}
+
+func loadAbsolute(ins LoadAbsolute, in []byte) (uint32, bool) {
+	offset := int(ins.Off)
+	size := ins.Size
+
+	return loadCommon(in, offset, size)
+}
+
+func loadConstant(ins LoadConstant, regA uint32, regX uint32) (uint32, uint32) {
+	switch ins.Dst {
+	case RegA:
+		regA = ins.Val
+	case RegX:
+		regX = ins.Val
+	}
+
+	return regA, regX
+}
+
+func loadExtension(ins LoadExtension, in []byte) uint32 {
+	switch ins.Num {
+	case ExtLen:
+		return uint32(len(in))
+	default:
+		panic(fmt.Sprintf("unimplemented extension: %d", ins.Num))
+	}
+}
+
+func loadIndirect(ins LoadIndirect, in []byte, regX uint32) (uint32, bool) {
+	offset := int(ins.Off) + int(regX)
+	size := ins.Size
+
+	return loadCommon(in, offset, size)
+}
+
+func loadMemShift(ins LoadMemShift, in []byte) (uint32, bool) {
+	offset := int(ins.Off)
+
+	// Size of LoadMemShift is always 1 byte
+	if !inBounds(len(in), offset, 1) {
+		return 0, false
+	}
+
+	// Mask off high 4 bits and multiply low 4 bits by 4
+	return uint32(in[offset]&0x0f) * 4, true
+}
+
+func inBounds(inLen int, offset int, size int) bool {
+	return offset+size <= inLen
+}
+
+func loadCommon(in []byte, offset int, size int) (uint32, bool) {
+	if !inBounds(len(in), offset, size) {
+		return 0, false
+	}
+
+	switch size {
+	case 1:
+		return uint32(in[offset]), true
+	case 2:
+		return uint32(binary.BigEndian.Uint16(in[offset : offset+size])), true
+	case 4:
+		return uint32(binary.BigEndian.Uint32(in[offset : offset+size])), true
+	default:
+		panic(fmt.Sprintf("invalid load size: %d", size))
+	}
+}
+
+func loadScratch(ins LoadScratch, regScratch [16]uint32, regA uint32, regX uint32) (uint32, uint32) {
+	switch ins.Dst {
+	case RegA:
+		regA = regScratch[ins.N]
+	case RegX:
+		regX = regScratch[ins.N]
+	}
+
+	return regA, regX
+}
+
+func storeScratch(ins StoreScratch, regScratch [16]uint32, regA uint32, regX uint32) [16]uint32 {
+	switch ins.Src {
+	case RegA:
+		regScratch[ins.N] = regA
+	case RegX:
+		regScratch[ins.N] = regX
+	}
+
+	return regScratch
+}

vendor/golang.org/x/net/icmp/dstunreach.go

@@ -0,0 +1,59 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+// A DstUnreach represents an ICMP destination unreachable message
+// body.
+type DstUnreach struct {
+	Data       []byte      // data, known as original datagram field
+	Extensions []Extension // extensions
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *DstUnreach) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	l, _ := multipartMessageBodyDataLen(proto, true, p.Data, p.Extensions)
+	return l
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *DstUnreach) Marshal(proto int) ([]byte, error) {
+	var typ Type
+	switch proto {
+	case iana.ProtocolICMP:
+		typ = ipv4.ICMPTypeDestinationUnreachable
+	case iana.ProtocolIPv6ICMP:
+		typ = ipv6.ICMPTypeDestinationUnreachable
+	default:
+		return nil, errInvalidProtocol
+	}
+	if !validExtensions(typ, p.Extensions) {
+		return nil, errInvalidExtension
+	}
+	return marshalMultipartMessageBody(proto, true, p.Data, p.Extensions)
+}
+
+// parseDstUnreach parses b as an ICMP destination unreachable message
+// body.
+func parseDstUnreach(proto int, typ Type, b []byte) (MessageBody, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	p := &DstUnreach{}
+	var err error
+	p.Data, p.Extensions, err = parseMultipartMessageBody(proto, typ, b)
+	if err != nil {
+		return nil, err
+	}
+	return p, nil
+}

vendor/golang.org/x/net/icmp/echo.go

@@ -0,0 +1,173 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"encoding/binary"
+
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+// An Echo represents an ICMP echo request or reply message body.
+type Echo struct {
+	ID   int    // identifier
+	Seq  int    // sequence number
+	Data []byte // data
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *Echo) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	return 4 + len(p.Data)
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *Echo) Marshal(proto int) ([]byte, error) {
+	b := make([]byte, 4+len(p.Data))
+	binary.BigEndian.PutUint16(b[:2], uint16(p.ID))
+	binary.BigEndian.PutUint16(b[2:4], uint16(p.Seq))
+	copy(b[4:], p.Data)
+	return b, nil
+}
+
+// parseEcho parses b as an ICMP echo request or reply message body.
+func parseEcho(proto int, _ Type, b []byte) (MessageBody, error) {
+	bodyLen := len(b)
+	if bodyLen < 4 {
+		return nil, errMessageTooShort
+	}
+	p := &Echo{ID: int(binary.BigEndian.Uint16(b[:2])), Seq: int(binary.BigEndian.Uint16(b[2:4]))}
+	if bodyLen > 4 {
+		p.Data = make([]byte, bodyLen-4)
+		copy(p.Data, b[4:])
+	}
+	return p, nil
+}
+
+// An ExtendedEchoRequest represents an ICMP extended echo request
+// message body.
+type ExtendedEchoRequest struct {
+	ID         int         // identifier
+	Seq        int         // sequence number
+	Local      bool        // must be true when identifying by name or index
+	Extensions []Extension // extensions
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *ExtendedEchoRequest) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	l, _ := multipartMessageBodyDataLen(proto, false, nil, p.Extensions)
+	return l
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *ExtendedEchoRequest) Marshal(proto int) ([]byte, error) {
+	var typ Type
+	switch proto {
+	case iana.ProtocolICMP:
+		typ = ipv4.ICMPTypeExtendedEchoRequest
+	case iana.ProtocolIPv6ICMP:
+		typ = ipv6.ICMPTypeExtendedEchoRequest
+	default:
+		return nil, errInvalidProtocol
+	}
+	if !validExtensions(typ, p.Extensions) {
+		return nil, errInvalidExtension
+	}
+	b, err := marshalMultipartMessageBody(proto, false, nil, p.Extensions)
+	if err != nil {
+		return nil, err
+	}
+	binary.BigEndian.PutUint16(b[:2], uint16(p.ID))
+	b[2] = byte(p.Seq)
+	if p.Local {
+		b[3] |= 0x01
+	}
+	return b, nil
+}
+
+// parseExtendedEchoRequest parses b as an ICMP extended echo request
+// message body.
+func parseExtendedEchoRequest(proto int, typ Type, b []byte) (MessageBody, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	p := &ExtendedEchoRequest{ID: int(binary.BigEndian.Uint16(b[:2])), Seq: int(b[2])}
+	if b[3]&0x01 != 0 {
+		p.Local = true
+	}
+	var err error
+	_, p.Extensions, err = parseMultipartMessageBody(proto, typ, b)
+	if err != nil {
+		return nil, err
+	}
+	return p, nil
+}
+
+// An ExtendedEchoReply represents an ICMP extended echo reply message
+// body.
+type ExtendedEchoReply struct {
+	ID     int  // identifier
+	Seq    int  // sequence number
+	State  int  // 3-bit state working together with Message.Code
+	Active bool // probed interface is active
+	IPv4   bool // probed interface runs IPv4
+	IPv6   bool // probed interface runs IPv6
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *ExtendedEchoReply) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	return 4
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *ExtendedEchoReply) Marshal(proto int) ([]byte, error) {
+	b := make([]byte, 4)
+	binary.BigEndian.PutUint16(b[:2], uint16(p.ID))
+	b[2] = byte(p.Seq)
+	b[3] = byte(p.State<<5) & 0xe0
+	if p.Active {
+		b[3] |= 0x04
+	}
+	if p.IPv4 {
+		b[3] |= 0x02
+	}
+	if p.IPv6 {
+		b[3] |= 0x01
+	}
+	return b, nil
+}
+
+// parseExtendedEchoReply parses b as an ICMP extended echo reply
+// message body.
+func parseExtendedEchoReply(proto int, _ Type, b []byte) (MessageBody, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	p := &ExtendedEchoReply{
+		ID:    int(binary.BigEndian.Uint16(b[:2])),
+		Seq:   int(b[2]),
+		State: int(b[3]) >> 5,
+	}
+	if b[3]&0x04 != 0 {
+		p.Active = true
+	}
+	if b[3]&0x02 != 0 {
+		p.IPv4 = true
+	}
+	if b[3]&0x01 != 0 {
+		p.IPv6 = true
+	}
+	return p, nil
+}

vendor/golang.org/x/net/icmp/endpoint.go

@@ -0,0 +1,113 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"net"
+	"runtime"
+	"time"
+
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+var _ net.PacketConn = &PacketConn{}
+
+// A PacketConn represents a packet network endpoint that uses either
+// ICMPv4 or ICMPv6.
+type PacketConn struct {
+	c  net.PacketConn
+	p4 *ipv4.PacketConn
+	p6 *ipv6.PacketConn
+}
+
+func (c *PacketConn) ok() bool { return c != nil && c.c != nil }
+
+// IPv4PacketConn returns the ipv4.PacketConn of c.
+// It returns nil when c is not created as the endpoint for ICMPv4.
+func (c *PacketConn) IPv4PacketConn() *ipv4.PacketConn {
+	if !c.ok() {
+		return nil
+	}
+	return c.p4
+}
+
+// IPv6PacketConn returns the ipv6.PacketConn of c.
+// It returns nil when c is not created as the endpoint for ICMPv6.
+func (c *PacketConn) IPv6PacketConn() *ipv6.PacketConn {
+	if !c.ok() {
+		return nil
+	}
+	return c.p6
+}
+
+// ReadFrom reads an ICMP message from the connection.
+func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	if !c.ok() {
+		return 0, nil, errInvalidConn
+	}
+	// Please be informed that ipv4.NewPacketConn enables
+	// IP_STRIPHDR option by default on Darwin.
+	// See golang.org/issue/9395 for further information.
+	if (runtime.GOOS == "darwin" || runtime.GOOS == "ios") && c.p4 != nil {
+		n, _, peer, err := c.p4.ReadFrom(b)
+		return n, peer, err
+	}
+	return c.c.ReadFrom(b)
+}
+
+// WriteTo writes the ICMP message b to dst.
+// The provided dst must be net.UDPAddr when c is a non-privileged
+// datagram-oriented ICMP endpoint.
+// Otherwise it must be net.IPAddr.
+func (c *PacketConn) WriteTo(b []byte, dst net.Addr) (int, error) {
+	if !c.ok() {
+		return 0, errInvalidConn
+	}
+	return c.c.WriteTo(b, dst)
+}
+
+// Close closes the endpoint.
+func (c *PacketConn) Close() error {
+	if !c.ok() {
+		return errInvalidConn
+	}
+	return c.c.Close()
+}
+
+// LocalAddr returns the local network address.
+func (c *PacketConn) LocalAddr() net.Addr {
+	if !c.ok() {
+		return nil
+	}
+	return c.c.LocalAddr()
+}
+
+// SetDeadline sets the read and write deadlines associated with the
+// endpoint.
+func (c *PacketConn) SetDeadline(t time.Time) error {
+	if !c.ok() {
+		return errInvalidConn
+	}
+	return c.c.SetDeadline(t)
+}
+
+// SetReadDeadline sets the read deadline associated with the
+// endpoint.
+func (c *PacketConn) SetReadDeadline(t time.Time) error {
+	if !c.ok() {
+		return errInvalidConn
+	}
+	return c.c.SetReadDeadline(t)
+}
+
+// SetWriteDeadline sets the write deadline associated with the
+// endpoint.
+func (c *PacketConn) SetWriteDeadline(t time.Time) error {
+	if !c.ok() {
+		return errInvalidConn
+	}
+	return c.c.SetWriteDeadline(t)
+}

vendor/golang.org/x/net/icmp/extension.go

@@ -0,0 +1,170 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"encoding/binary"
+
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+// An Extension represents an ICMP extension.
+type Extension interface {
+	// Len returns the length of ICMP extension.
+	// The provided proto must be either the ICMPv4 or ICMPv6
+	// protocol number.
+	Len(proto int) int
+
+	// Marshal returns the binary encoding of ICMP extension.
+	// The provided proto must be either the ICMPv4 or ICMPv6
+	// protocol number.
+	Marshal(proto int) ([]byte, error)
+}
+
+const extensionVersion = 2
+
+func validExtensionHeader(b []byte) bool {
+	v := int(b[0]&0xf0) >> 4
+	s := binary.BigEndian.Uint16(b[2:4])
+	if s != 0 {
+		s = checksum(b)
+	}
+	if v != extensionVersion || s != 0 {
+		return false
+	}
+	return true
+}
+
+// parseExtensions parses b as a list of ICMP extensions.
+// The length attribute l must be the length attribute field in
+// received icmp messages.
+//
+// It will return a list of ICMP extensions and an adjusted length
+// attribute that represents the length of the padded original
+// datagram field. Otherwise, it returns an error.
+func parseExtensions(typ Type, b []byte, l int) ([]Extension, int, error) {
+	// Still a lot of non-RFC 4884 compliant implementations are
+	// out there. Set the length attribute l to 128 when it looks
+	// inappropriate for backwards compatibility.
+	//
+	// A minimal extension at least requires 8 octets; 4 octets
+	// for an extension header, and 4 octets for a single object
+	// header.
+	//
+	// See RFC 4884 for further information.
+	switch typ {
+	case ipv4.ICMPTypeExtendedEchoRequest, ipv6.ICMPTypeExtendedEchoRequest:
+		if len(b) < 8 || !validExtensionHeader(b) {
+			return nil, -1, errNoExtension
+		}
+		l = 0
+	default:
+		if 128 > l || l+8 > len(b) {
+			l = 128
+		}
+		if l+8 > len(b) {
+			return nil, -1, errNoExtension
+		}
+		if !validExtensionHeader(b[l:]) {
+			if l == 128 {
+				return nil, -1, errNoExtension
+			}
+			l = 128
+			if !validExtensionHeader(b[l:]) {
+				return nil, -1, errNoExtension
+			}
+		}
+	}
+	var exts []Extension
+	for b = b[l+4:]; len(b) >= 4; {
+		ol := int(binary.BigEndian.Uint16(b[:2]))
+		if 4 > ol || ol > len(b) {
+			break
+		}
+		switch b[2] {
+		case classMPLSLabelStack:
+			ext, err := parseMPLSLabelStack(b[:ol])
+			if err != nil {
+				return nil, -1, err
+			}
+			exts = append(exts, ext)
+		case classInterfaceInfo:
+			ext, err := parseInterfaceInfo(b[:ol])
+			if err != nil {
+				return nil, -1, err
+			}
+			exts = append(exts, ext)
+		case classInterfaceIdent:
+			ext, err := parseInterfaceIdent(b[:ol])
+			if err != nil {
+				return nil, -1, err
+			}
+			exts = append(exts, ext)
+		default:
+			ext := &RawExtension{Data: make([]byte, ol)}
+			copy(ext.Data, b[:ol])
+			exts = append(exts, ext)
+		}
+		b = b[ol:]
+	}
+	return exts, l, nil
+}
+
+func validExtensions(typ Type, exts []Extension) bool {
+	switch typ {
+	case ipv4.ICMPTypeDestinationUnreachable, ipv4.ICMPTypeTimeExceeded, ipv4.ICMPTypeParameterProblem,
+		ipv6.ICMPTypeDestinationUnreachable, ipv6.ICMPTypeTimeExceeded:
+		for i := range exts {
+			switch exts[i].(type) {
+			case *MPLSLabelStack, *InterfaceInfo, *RawExtension:
+			default:
+				return false
+			}
+		}
+		return true
+	case ipv4.ICMPTypeExtendedEchoRequest, ipv6.ICMPTypeExtendedEchoRequest:
+		var n int
+		for i := range exts {
+			switch exts[i].(type) {
+			case *InterfaceIdent:
+				n++
+			case *RawExtension:
+			default:
+				return false
+			}
+		}
+		// Not a single InterfaceIdent object or a combo of
+		// RawExtension and InterfaceIdent objects is not
+		// allowed.
+		if n == 1 && len(exts) > 1 {
+			return false
+		}
+		return true
+	default:
+		return false
+	}
+}
+
+// A RawExtension represents a raw extension.
+//
+// A raw extension is excluded from message processing and can be used
+// to construct applications such as protocol conformance testing.
+type RawExtension struct {
+	Data []byte // data
+}
+
+// Len implements the Len method of Extension interface.
+func (p *RawExtension) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	return len(p.Data)
+}
+
+// Marshal implements the Marshal method of Extension interface.
+func (p *RawExtension) Marshal(proto int) ([]byte, error) {
+	return p.Data, nil
+}

vendor/golang.org/x/net/icmp/helper_posix.go

@@ -0,0 +1,75 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows
+
+package icmp
+
+import (
+	"net"
+	"strconv"
+	"syscall"
+)
+
+func sockaddr(family int, address string) (syscall.Sockaddr, error) {
+	switch family {
+	case syscall.AF_INET:
+		a, err := net.ResolveIPAddr("ip4", address)
+		if err != nil {
+			return nil, err
+		}
+		if len(a.IP) == 0 {
+			a.IP = net.IPv4zero
+		}
+		if a.IP = a.IP.To4(); a.IP == nil {
+			return nil, net.InvalidAddrError("non-ipv4 address")
+		}
+		sa := &syscall.SockaddrInet4{}
+		copy(sa.Addr[:], a.IP)
+		return sa, nil
+	case syscall.AF_INET6:
+		a, err := net.ResolveIPAddr("ip6", address)
+		if err != nil {
+			return nil, err
+		}
+		if len(a.IP) == 0 {
+			a.IP = net.IPv6unspecified
+		}
+		if a.IP.Equal(net.IPv4zero) {
+			a.IP = net.IPv6unspecified
+		}
+		if a.IP = a.IP.To16(); a.IP == nil || a.IP.To4() != nil {
+			return nil, net.InvalidAddrError("non-ipv6 address")
+		}
+		sa := &syscall.SockaddrInet6{ZoneId: zoneToUint32(a.Zone)}
+		copy(sa.Addr[:], a.IP)
+		return sa, nil
+	default:
+		return nil, net.InvalidAddrError("unexpected family")
+	}
+}
+
+func zoneToUint32(zone string) uint32 {
+	if zone == "" {
+		return 0
+	}
+	if ifi, err := net.InterfaceByName(zone); err == nil {
+		return uint32(ifi.Index)
+	}
+	n, err := strconv.Atoi(zone)
+	if err != nil {
+		return 0
+	}
+	return uint32(n)
+}
+
+func last(s string, b byte) int {
+	i := len(s)
+	for i--; i >= 0; i-- {
+		if s[i] == b {
+			break
+		}
+	}
+	return i
+}

vendor/golang.org/x/net/icmp/interface.go

@@ -0,0 +1,322 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"encoding/binary"
+	"net"
+	"strings"
+
+	"golang.org/x/net/internal/iana"
+)
+
+const (
+	classInterfaceInfo = 2
+)
+
+const (
+	attrMTU = 1 << iota
+	attrName
+	attrIPAddr
+	attrIfIndex
+)
+
+// An InterfaceInfo represents interface and next-hop identification.
+type InterfaceInfo struct {
+	Class     int // extension object class number
+	Type      int // extension object sub-type
+	Interface *net.Interface
+	Addr      *net.IPAddr
+}
+
+func (ifi *InterfaceInfo) nameLen() int {
+	if len(ifi.Interface.Name) > 63 {
+		return 64
+	}
+	l := 1 + len(ifi.Interface.Name)
+	return (l + 3) &^ 3
+}
+
+func (ifi *InterfaceInfo) attrsAndLen(proto int) (attrs, l int) {
+	l = 4
+	if ifi.Interface != nil && ifi.Interface.Index > 0 {
+		attrs |= attrIfIndex
+		l += 4
+		if len(ifi.Interface.Name) > 0 {
+			attrs |= attrName
+			l += ifi.nameLen()
+		}
+		if ifi.Interface.MTU > 0 {
+			attrs |= attrMTU
+			l += 4
+		}
+	}
+	if ifi.Addr != nil {
+		switch proto {
+		case iana.ProtocolICMP:
+			if ifi.Addr.IP.To4() != nil {
+				attrs |= attrIPAddr
+				l += 4 + net.IPv4len
+			}
+		case iana.ProtocolIPv6ICMP:
+			if ifi.Addr.IP.To16() != nil && ifi.Addr.IP.To4() == nil {
+				attrs |= attrIPAddr
+				l += 4 + net.IPv6len
+			}
+		}
+	}
+	return
+}
+
+// Len implements the Len method of Extension interface.
+func (ifi *InterfaceInfo) Len(proto int) int {
+	_, l := ifi.attrsAndLen(proto)
+	return l
+}
+
+// Marshal implements the Marshal method of Extension interface.
+func (ifi *InterfaceInfo) Marshal(proto int) ([]byte, error) {
+	attrs, l := ifi.attrsAndLen(proto)
+	b := make([]byte, l)
+	if err := ifi.marshal(proto, b, attrs, l); err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+func (ifi *InterfaceInfo) marshal(proto int, b []byte, attrs, l int) error {
+	binary.BigEndian.PutUint16(b[:2], uint16(l))
+	b[2], b[3] = classInterfaceInfo, byte(ifi.Type)
+	for b = b[4:]; len(b) > 0 && attrs != 0; {
+		switch {
+		case attrs&attrIfIndex != 0:
+			b = ifi.marshalIfIndex(proto, b)
+			attrs &^= attrIfIndex
+		case attrs&attrIPAddr != 0:
+			b = ifi.marshalIPAddr(proto, b)
+			attrs &^= attrIPAddr
+		case attrs&attrName != 0:
+			b = ifi.marshalName(proto, b)
+			attrs &^= attrName
+		case attrs&attrMTU != 0:
+			b = ifi.marshalMTU(proto, b)
+			attrs &^= attrMTU
+		}
+	}
+	return nil
+}
+
+func (ifi *InterfaceInfo) marshalIfIndex(proto int, b []byte) []byte {
+	binary.BigEndian.PutUint32(b[:4], uint32(ifi.Interface.Index))
+	return b[4:]
+}
+
+func (ifi *InterfaceInfo) parseIfIndex(b []byte) ([]byte, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	ifi.Interface.Index = int(binary.BigEndian.Uint32(b[:4]))
+	return b[4:], nil
+}
+
+func (ifi *InterfaceInfo) marshalIPAddr(proto int, b []byte) []byte {
+	switch proto {
+	case iana.ProtocolICMP:
+		binary.BigEndian.PutUint16(b[:2], uint16(iana.AddrFamilyIPv4))
+		copy(b[4:4+net.IPv4len], ifi.Addr.IP.To4())
+		b = b[4+net.IPv4len:]
+	case iana.ProtocolIPv6ICMP:
+		binary.BigEndian.PutUint16(b[:2], uint16(iana.AddrFamilyIPv6))
+		copy(b[4:4+net.IPv6len], ifi.Addr.IP.To16())
+		b = b[4+net.IPv6len:]
+	}
+	return b
+}
+
+func (ifi *InterfaceInfo) parseIPAddr(b []byte) ([]byte, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	afi := int(binary.BigEndian.Uint16(b[:2]))
+	b = b[4:]
+	switch afi {
+	case iana.AddrFamilyIPv4:
+		if len(b) < net.IPv4len {
+			return nil, errMessageTooShort
+		}
+		ifi.Addr.IP = make(net.IP, net.IPv4len)
+		copy(ifi.Addr.IP, b[:net.IPv4len])
+		b = b[net.IPv4len:]
+	case iana.AddrFamilyIPv6:
+		if len(b) < net.IPv6len {
+			return nil, errMessageTooShort
+		}
+		ifi.Addr.IP = make(net.IP, net.IPv6len)
+		copy(ifi.Addr.IP, b[:net.IPv6len])
+		b = b[net.IPv6len:]
+	}
+	return b, nil
+}
+
+func (ifi *InterfaceInfo) marshalName(proto int, b []byte) []byte {
+	l := byte(ifi.nameLen())
+	b[0] = l
+	copy(b[1:], []byte(ifi.Interface.Name))
+	return b[l:]
+}
+
+func (ifi *InterfaceInfo) parseName(b []byte) ([]byte, error) {
+	if 4 > len(b) || len(b) < int(b[0]) {
+		return nil, errMessageTooShort
+	}
+	l := int(b[0])
+	if l%4 != 0 || 4 > l || l > 64 {
+		return nil, errInvalidExtension
+	}
+	var name [63]byte
+	copy(name[:], b[1:l])
+	ifi.Interface.Name = strings.Trim(string(name[:]), "\000")
+	return b[l:], nil
+}
+
+func (ifi *InterfaceInfo) marshalMTU(proto int, b []byte) []byte {
+	binary.BigEndian.PutUint32(b[:4], uint32(ifi.Interface.MTU))
+	return b[4:]
+}
+
+func (ifi *InterfaceInfo) parseMTU(b []byte) ([]byte, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	ifi.Interface.MTU = int(binary.BigEndian.Uint32(b[:4]))
+	return b[4:], nil
+}
+
+func parseInterfaceInfo(b []byte) (Extension, error) {
+	ifi := &InterfaceInfo{
+		Class: int(b[2]),
+		Type:  int(b[3]),
+	}
+	if ifi.Type&(attrIfIndex|attrName|attrMTU) != 0 {
+		ifi.Interface = &net.Interface{}
+	}
+	if ifi.Type&attrIPAddr != 0 {
+		ifi.Addr = &net.IPAddr{}
+	}
+	attrs := ifi.Type & (attrIfIndex | attrIPAddr | attrName | attrMTU)
+	for b = b[4:]; len(b) > 0 && attrs != 0; {
+		var err error
+		switch {
+		case attrs&attrIfIndex != 0:
+			b, err = ifi.parseIfIndex(b)
+			attrs &^= attrIfIndex
+		case attrs&attrIPAddr != 0:
+			b, err = ifi.parseIPAddr(b)
+			attrs &^= attrIPAddr
+		case attrs&attrName != 0:
+			b, err = ifi.parseName(b)
+			attrs &^= attrName
+		case attrs&attrMTU != 0:
+			b, err = ifi.parseMTU(b)
+			attrs &^= attrMTU
+		}
+		if err != nil {
+			return nil, err
+		}
+	}
+	if ifi.Interface != nil && ifi.Interface.Name != "" && ifi.Addr != nil && ifi.Addr.IP.To16() != nil && ifi.Addr.IP.To4() == nil {
+		ifi.Addr.Zone = ifi.Interface.Name
+	}
+	return ifi, nil
+}
+
+const (
+	classInterfaceIdent    = 3
+	typeInterfaceByName    = 1
+	typeInterfaceByIndex   = 2
+	typeInterfaceByAddress = 3
+)
+
+// An InterfaceIdent represents interface identification.
+type InterfaceIdent struct {
+	Class int    // extension object class number
+	Type  int    // extension object sub-type
+	Name  string // interface name
+	Index int    // interface index
+	AFI   int    // address family identifier; see address family numbers in IANA registry
+	Addr  []byte // address
+}
+
+// Len implements the Len method of Extension interface.
+func (ifi *InterfaceIdent) Len(_ int) int {
+	switch ifi.Type {
+	case typeInterfaceByName:
+		l := len(ifi.Name)
+		if l > 255 {
+			l = 255
+		}
+		return 4 + (l+3)&^3
+	case typeInterfaceByIndex:
+		return 4 + 4
+	case typeInterfaceByAddress:
+		return 4 + 4 + (len(ifi.Addr)+3)&^3
+	default:
+		return 4
+	}
+}
+
+// Marshal implements the Marshal method of Extension interface.
+func (ifi *InterfaceIdent) Marshal(proto int) ([]byte, error) {
+	b := make([]byte, ifi.Len(proto))
+	if err := ifi.marshal(proto, b); err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+func (ifi *InterfaceIdent) marshal(proto int, b []byte) error {
+	l := ifi.Len(proto)
+	binary.BigEndian.PutUint16(b[:2], uint16(l))
+	b[2], b[3] = classInterfaceIdent, byte(ifi.Type)
+	switch ifi.Type {
+	case typeInterfaceByName:
+		copy(b[4:], ifi.Name)
+	case typeInterfaceByIndex:
+		binary.BigEndian.PutUint32(b[4:4+4], uint32(ifi.Index))
+	case typeInterfaceByAddress:
+		binary.BigEndian.PutUint16(b[4:4+2], uint16(ifi.AFI))
+		b[4+2] = byte(len(ifi.Addr))
+		copy(b[4+4:], ifi.Addr)
+	}
+	return nil
+}
+
+func parseInterfaceIdent(b []byte) (Extension, error) {
+	ifi := &InterfaceIdent{
+		Class: int(b[2]),
+		Type:  int(b[3]),
+	}
+	switch ifi.Type {
+	case typeInterfaceByName:
+		ifi.Name = strings.Trim(string(b[4:]), "\x00")
+	case typeInterfaceByIndex:
+		if len(b[4:]) < 4 {
+			return nil, errInvalidExtension
+		}
+		ifi.Index = int(binary.BigEndian.Uint32(b[4 : 4+4]))
+	case typeInterfaceByAddress:
+		if len(b[4:]) < 4 {
+			return nil, errInvalidExtension
+		}
+		ifi.AFI = int(binary.BigEndian.Uint16(b[4 : 4+2]))
+		l := int(b[4+2])
+		if len(b[4+4:]) < l {
+			return nil, errInvalidExtension
+		}
+		ifi.Addr = make([]byte, l)
+		copy(ifi.Addr, b[4+4:])
+	}
+	return ifi, nil
+}

vendor/golang.org/x/net/icmp/ipv4.go

@@ -0,0 +1,69 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"encoding/binary"
+	"net"
+	"runtime"
+
+	"golang.org/x/net/internal/socket"
+	"golang.org/x/net/ipv4"
+)
+
+// freebsdVersion is set in sys_freebsd.go.
+// See http://www.freebsd.org/doc/en/books/porters-handbook/freebsd-versions.html.
+var freebsdVersion uint32
+
+// ParseIPv4Header returns the IPv4 header of the IPv4 packet that
+// triggered an ICMP error message.
+// This is found in the Data field of the ICMP error message body.
+//
+// The provided b must be in the format used by a raw ICMP socket on
+// the local system.
+// This may differ from the wire format, and the format used by a raw
+// IP socket, depending on the system.
+//
+// To parse an IPv6 header, use ipv6.ParseHeader.
+func ParseIPv4Header(b []byte) (*ipv4.Header, error) {
+	if len(b) < ipv4.HeaderLen {
+		return nil, errHeaderTooShort
+	}
+	hdrlen := int(b[0]&0x0f) << 2
+	if hdrlen > len(b) {
+		return nil, errBufferTooShort
+	}
+	h := &ipv4.Header{
+		Version:  int(b[0] >> 4),
+		Len:      hdrlen,
+		TOS:      int(b[1]),
+		ID:       int(binary.BigEndian.Uint16(b[4:6])),
+		FragOff:  int(binary.BigEndian.Uint16(b[6:8])),
+		TTL:      int(b[8]),
+		Protocol: int(b[9]),
+		Checksum: int(binary.BigEndian.Uint16(b[10:12])),
+		Src:      net.IPv4(b[12], b[13], b[14], b[15]),
+		Dst:      net.IPv4(b[16], b[17], b[18], b[19]),
+	}
+	switch runtime.GOOS {
+	case "darwin", "ios":
+		h.TotalLen = int(socket.NativeEndian.Uint16(b[2:4]))
+	case "freebsd":
+		if freebsdVersion >= 1000000 {
+			h.TotalLen = int(binary.BigEndian.Uint16(b[2:4]))
+		} else {
+			h.TotalLen = int(socket.NativeEndian.Uint16(b[2:4]))
+		}
+	default:
+		h.TotalLen = int(binary.BigEndian.Uint16(b[2:4]))
+	}
+	h.Flags = ipv4.HeaderFlags(h.FragOff&0xe000) >> 13
+	h.FragOff = h.FragOff & 0x1fff
+	if hdrlen-ipv4.HeaderLen > 0 {
+		h.Options = make([]byte, hdrlen-ipv4.HeaderLen)
+		copy(h.Options, b[ipv4.HeaderLen:])
+	}
+	return h, nil
+}

vendor/golang.org/x/net/icmp/ipv6.go

@@ -0,0 +1,23 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"net"
+
+	"golang.org/x/net/internal/iana"
+)
+
+const ipv6PseudoHeaderLen = 2*net.IPv6len + 8
+
+// IPv6PseudoHeader returns an IPv6 pseudo header for checksum
+// calculation.
+func IPv6PseudoHeader(src, dst net.IP) []byte {
+	b := make([]byte, ipv6PseudoHeaderLen)
+	copy(b, src.To16())
+	copy(b[net.IPv6len:], dst.To16())
+	b[len(b)-1] = byte(iana.ProtocolIPv6ICMP)
+	return b
+}

vendor/golang.org/x/net/icmp/listen_posix.go

@@ -0,0 +1,105 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows
+
+package icmp
+
+import (
+	"net"
+	"os"
+	"runtime"
+	"syscall"
+
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+const sysIP_STRIPHDR = 0x17 // for now only darwin supports this option
+
+// ListenPacket listens for incoming ICMP packets addressed to
+// address. See net.Dial for the syntax of address.
+//
+// For non-privileged datagram-oriented ICMP endpoints, network must
+// be "udp4" or "udp6". The endpoint allows to read, write a few
+// limited ICMP messages such as echo request and echo reply.
+// Currently only Darwin and Linux support this.
+//
+// Examples:
+//
+//	ListenPacket("udp4", "192.168.0.1")
+//	ListenPacket("udp4", "0.0.0.0")
+//	ListenPacket("udp6", "fe80::1%en0")
+//	ListenPacket("udp6", "::")
+//
+// For privileged raw ICMP endpoints, network must be "ip4" or "ip6"
+// followed by a colon and an ICMP protocol number or name.
+//
+// Examples:
+//
+//	ListenPacket("ip4:icmp", "192.168.0.1")
+//	ListenPacket("ip4:1", "0.0.0.0")
+//	ListenPacket("ip6:ipv6-icmp", "fe80::1%en0")
+//	ListenPacket("ip6:58", "::")
+func ListenPacket(network, address string) (*PacketConn, error) {
+	var family, proto int
+	switch network {
+	case "udp4":
+		family, proto = syscall.AF_INET, iana.ProtocolICMP
+	case "udp6":
+		family, proto = syscall.AF_INET6, iana.ProtocolIPv6ICMP
+	default:
+		i := last(network, ':')
+		if i < 0 {
+			i = len(network)
+		}
+		switch network[:i] {
+		case "ip4":
+			proto = iana.ProtocolICMP
+		case "ip6":
+			proto = iana.ProtocolIPv6ICMP
+		}
+	}
+	var cerr error
+	var c net.PacketConn
+	switch family {
+	case syscall.AF_INET, syscall.AF_INET6:
+		s, err := syscall.Socket(family, syscall.SOCK_DGRAM, proto)
+		if err != nil {
+			return nil, os.NewSyscallError("socket", err)
+		}
+		if (runtime.GOOS == "darwin" || runtime.GOOS == "ios") && family == syscall.AF_INET {
+			if err := syscall.SetsockoptInt(s, iana.ProtocolIP, sysIP_STRIPHDR, 1); err != nil {
+				syscall.Close(s)
+				return nil, os.NewSyscallError("setsockopt", err)
+			}
+		}
+		sa, err := sockaddr(family, address)
+		if err != nil {
+			syscall.Close(s)
+			return nil, err
+		}
+		if err := syscall.Bind(s, sa); err != nil {
+			syscall.Close(s)
+			return nil, os.NewSyscallError("bind", err)
+		}
+		f := os.NewFile(uintptr(s), "datagram-oriented icmp")
+		c, cerr = net.FilePacketConn(f)
+		f.Close()
+	default:
+		c, cerr = net.ListenPacket(network, address)
+	}
+	if cerr != nil {
+		return nil, cerr
+	}
+	switch proto {
+	case iana.ProtocolICMP:
+		return &PacketConn{c: c, p4: ipv4.NewPacketConn(c)}, nil
+	case iana.ProtocolIPv6ICMP:
+		return &PacketConn{c: c, p6: ipv6.NewPacketConn(c)}, nil
+	default:
+		return &PacketConn{c: c}, nil
+	}
+}

vendor/golang.org/x/net/icmp/listen_stub.go

@@ -0,0 +1,35 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows
+
+package icmp
+
+// ListenPacket listens for incoming ICMP packets addressed to
+// address. See net.Dial for the syntax of address.
+//
+// For non-privileged datagram-oriented ICMP endpoints, network must
+// be "udp4" or "udp6". The endpoint allows to read, write a few
+// limited ICMP messages such as echo request and echo reply.
+// Currently only Darwin and Linux support this.
+//
+// Examples:
+//
+//	ListenPacket("udp4", "192.168.0.1")
+//	ListenPacket("udp4", "0.0.0.0")
+//	ListenPacket("udp6", "fe80::1%en0")
+//	ListenPacket("udp6", "::")
+//
+// For privileged raw ICMP endpoints, network must be "ip4" or "ip6"
+// followed by a colon and an ICMP protocol number or name.
+//
+// Examples:
+//
+//	ListenPacket("ip4:icmp", "192.168.0.1")
+//	ListenPacket("ip4:1", "0.0.0.0")
+//	ListenPacket("ip6:ipv6-icmp", "fe80::1%en0")
+//	ListenPacket("ip6:58", "::")
+func ListenPacket(network, address string) (*PacketConn, error) {
+	return nil, errNotImplemented
+}

vendor/golang.org/x/net/icmp/message.go

@@ -0,0 +1,162 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package icmp provides basic functions for the manipulation of
+// messages used in the Internet Control Message Protocols,
+// ICMPv4 and ICMPv6.
+//
+// ICMPv4 and ICMPv6 are defined in RFC 792 and RFC 4443.
+// Multi-part message support for ICMP is defined in RFC 4884.
+// ICMP extensions for MPLS are defined in RFC 4950.
+// ICMP extensions for interface and next-hop identification are
+// defined in RFC 5837.
+// PROBE: A utility for probing interfaces is defined in RFC 8335.
+package icmp // import "golang.org/x/net/icmp"
+
+import (
+	"encoding/binary"
+	"errors"
+	"net"
+	"runtime"
+
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+// BUG(mikio): This package is not implemented on JS, NaCl and Plan 9.
+
+var (
+	errInvalidConn      = errors.New("invalid connection")
+	errInvalidProtocol  = errors.New("invalid protocol")
+	errMessageTooShort  = errors.New("message too short")
+	errHeaderTooShort   = errors.New("header too short")
+	errBufferTooShort   = errors.New("buffer too short")
+	errInvalidBody      = errors.New("invalid body")
+	errNoExtension      = errors.New("no extension")
+	errInvalidExtension = errors.New("invalid extension")
+	errNotImplemented   = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH)
+)
+
+func checksum(b []byte) uint16 {
+	csumcv := len(b) - 1 // checksum coverage
+	s := uint32(0)
+	for i := 0; i < csumcv; i += 2 {
+		s += uint32(b[i+1])<<8 | uint32(b[i])
+	}
+	if csumcv&1 == 0 {
+		s += uint32(b[csumcv])
+	}
+	s = s>>16 + s&0xffff
+	s = s + s>>16
+	return ^uint16(s)
+}
+
+// A Type represents an ICMP message type.
+type Type interface {
+	Protocol() int
+}
+
+// A Message represents an ICMP message.
+type Message struct {
+	Type     Type        // type, either ipv4.ICMPType or ipv6.ICMPType
+	Code     int         // code
+	Checksum int         // checksum
+	Body     MessageBody // body
+}
+
+// Marshal returns the binary encoding of the ICMP message m.
+//
+// For an ICMPv4 message, the returned message always contains the
+// calculated checksum field.
+//
+// For an ICMPv6 message, the returned message contains the calculated
+// checksum field when psh is not nil, otherwise the kernel will
+// compute the checksum field during the message transmission.
+// When psh is not nil, it must be the pseudo header for IPv6.
+func (m *Message) Marshal(psh []byte) ([]byte, error) {
+	var mtype byte
+	switch typ := m.Type.(type) {
+	case ipv4.ICMPType:
+		mtype = byte(typ)
+	case ipv6.ICMPType:
+		mtype = byte(typ)
+	default:
+		return nil, errInvalidProtocol
+	}
+	b := []byte{mtype, byte(m.Code), 0, 0}
+	proto := m.Type.Protocol()
+	if proto == iana.ProtocolIPv6ICMP && psh != nil {
+		b = append(psh, b...)
+	}
+	if m.Body != nil && m.Body.Len(proto) != 0 {
+		mb, err := m.Body.Marshal(proto)
+		if err != nil {
+			return nil, err
+		}
+		b = append(b, mb...)
+	}
+	if proto == iana.ProtocolIPv6ICMP {
+		if psh == nil { // cannot calculate checksum here
+			return b, nil
+		}
+		off, l := 2*net.IPv6len, len(b)-len(psh)
+		binary.BigEndian.PutUint32(b[off:off+4], uint32(l))
+	}
+	s := checksum(b)
+	// Place checksum back in header; using ^= avoids the
+	// assumption the checksum bytes are zero.
+	b[len(psh)+2] ^= byte(s)
+	b[len(psh)+3] ^= byte(s >> 8)
+	return b[len(psh):], nil
+}
+
+var parseFns = map[Type]func(int, Type, []byte) (MessageBody, error){
+	ipv4.ICMPTypeDestinationUnreachable: parseDstUnreach,
+	ipv4.ICMPTypeTimeExceeded:           parseTimeExceeded,
+	ipv4.ICMPTypeParameterProblem:       parseParamProb,
+
+	ipv4.ICMPTypeEcho:                parseEcho,
+	ipv4.ICMPTypeEchoReply:           parseEcho,
+	ipv4.ICMPTypeExtendedEchoRequest: parseExtendedEchoRequest,
+	ipv4.ICMPTypeExtendedEchoReply:   parseExtendedEchoReply,
+
+	ipv6.ICMPTypeDestinationUnreachable: parseDstUnreach,
+	ipv6.ICMPTypePacketTooBig:           parsePacketTooBig,
+	ipv6.ICMPTypeTimeExceeded:           parseTimeExceeded,
+	ipv6.ICMPTypeParameterProblem:       parseParamProb,
+
+	ipv6.ICMPTypeEchoRequest:         parseEcho,
+	ipv6.ICMPTypeEchoReply:           parseEcho,
+	ipv6.ICMPTypeExtendedEchoRequest: parseExtendedEchoRequest,
+	ipv6.ICMPTypeExtendedEchoReply:   parseExtendedEchoReply,
+}
+
+// ParseMessage parses b as an ICMP message.
+// The provided proto must be either the ICMPv4 or ICMPv6 protocol
+// number.
+func ParseMessage(proto int, b []byte) (*Message, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	var err error
+	m := &Message{Code: int(b[1]), Checksum: int(binary.BigEndian.Uint16(b[2:4]))}
+	switch proto {
+	case iana.ProtocolICMP:
+		m.Type = ipv4.ICMPType(b[0])
+	case iana.ProtocolIPv6ICMP:
+		m.Type = ipv6.ICMPType(b[0])
+	default:
+		return nil, errInvalidProtocol
+	}
+	if fn, ok := parseFns[m.Type]; !ok {
+		m.Body, err = parseRawBody(proto, b[4:])
+	} else {
+		m.Body, err = fn(proto, m.Type, b[4:])
+	}
+	if err != nil {
+		return nil, err
+	}
+	return m, nil
+}

vendor/golang.org/x/net/icmp/messagebody.go

@@ -0,0 +1,52 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+// A MessageBody represents an ICMP message body.
+type MessageBody interface {
+	// Len returns the length of ICMP message body.
+	// The provided proto must be either the ICMPv4 or ICMPv6
+	// protocol number.
+	Len(proto int) int
+
+	// Marshal returns the binary encoding of ICMP message body.
+	// The provided proto must be either the ICMPv4 or ICMPv6
+	// protocol number.
+	Marshal(proto int) ([]byte, error)
+}
+
+// A RawBody represents a raw message body.
+//
+// A raw message body is excluded from message processing and can be
+// used to construct applications such as protocol conformance
+// testing.
+type RawBody struct {
+	Data []byte // data
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *RawBody) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	return len(p.Data)
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *RawBody) Marshal(proto int) ([]byte, error) {
+	return p.Data, nil
+}
+
+// parseRawBody parses b as an ICMP message body.
+func parseRawBody(proto int, b []byte) (MessageBody, error) {
+	p := &RawBody{Data: make([]byte, len(b))}
+	copy(p.Data, b)
+	return p, nil
+}
+
+// A DefaultMessageBody represents the default message body.
+//
+// Deprecated: Use RawBody instead.
+type DefaultMessageBody = RawBody

vendor/golang.org/x/net/icmp/mpls.go

@@ -0,0 +1,77 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import "encoding/binary"
+
+// MPLSLabel represents an MPLS label stack entry.
+type MPLSLabel struct {
+	Label int  // label value
+	TC    int  // traffic class; formerly experimental use
+	S     bool // bottom of stack
+	TTL   int  // time to live
+}
+
+const (
+	classMPLSLabelStack        = 1
+	typeIncomingMPLSLabelStack = 1
+)
+
+// MPLSLabelStack represents an MPLS label stack.
+type MPLSLabelStack struct {
+	Class  int // extension object class number
+	Type   int // extension object sub-type
+	Labels []MPLSLabel
+}
+
+// Len implements the Len method of Extension interface.
+func (ls *MPLSLabelStack) Len(proto int) int {
+	return 4 + (4 * len(ls.Labels))
+}
+
+// Marshal implements the Marshal method of Extension interface.
+func (ls *MPLSLabelStack) Marshal(proto int) ([]byte, error) {
+	b := make([]byte, ls.Len(proto))
+	if err := ls.marshal(proto, b); err != nil {
+		return nil, err
+	}
+	return b, nil
+}
+
+func (ls *MPLSLabelStack) marshal(proto int, b []byte) error {
+	l := ls.Len(proto)
+	binary.BigEndian.PutUint16(b[:2], uint16(l))
+	b[2], b[3] = classMPLSLabelStack, typeIncomingMPLSLabelStack
+	off := 4
+	for _, ll := range ls.Labels {
+		b[off], b[off+1], b[off+2] = byte(ll.Label>>12), byte(ll.Label>>4&0xff), byte(ll.Label<<4&0xf0)
+		b[off+2] |= byte(ll.TC << 1 & 0x0e)
+		if ll.S {
+			b[off+2] |= 0x1
+		}
+		b[off+3] = byte(ll.TTL)
+		off += 4
+	}
+	return nil
+}
+
+func parseMPLSLabelStack(b []byte) (Extension, error) {
+	ls := &MPLSLabelStack{
+		Class: int(b[2]),
+		Type:  int(b[3]),
+	}
+	for b = b[4:]; len(b) >= 4; b = b[4:] {
+		ll := MPLSLabel{
+			Label: int(b[0])<<12 | int(b[1])<<4 | int(b[2])>>4,
+			TC:    int(b[2]&0x0e) >> 1,
+			TTL:   int(b[3]),
+		}
+		if b[2]&0x1 != 0 {
+			ll.S = true
+		}
+		ls.Labels = append(ls.Labels, ll)
+	}
+	return ls, nil
+}

vendor/golang.org/x/net/icmp/multipart.go

@@ -0,0 +1,129 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import "golang.org/x/net/internal/iana"
+
+// multipartMessageBodyDataLen takes b as an original datagram and
+// exts as extensions, and returns a required length for message body
+// and a required length for a padded original datagram in wire
+// format.
+func multipartMessageBodyDataLen(proto int, withOrigDgram bool, b []byte, exts []Extension) (bodyLen, dataLen int) {
+	bodyLen = 4 // length of leading octets
+	var extLen int
+	var rawExt bool // raw extension may contain an empty object
+	for _, ext := range exts {
+		extLen += ext.Len(proto)
+		if _, ok := ext.(*RawExtension); ok {
+			rawExt = true
+		}
+	}
+	if extLen > 0 && withOrigDgram {
+		dataLen = multipartMessageOrigDatagramLen(proto, b)
+	} else {
+		dataLen = len(b)
+	}
+	if extLen > 0 || rawExt {
+		bodyLen += 4 // length of extension header
+	}
+	bodyLen += dataLen + extLen
+	return bodyLen, dataLen
+}
+
+// multipartMessageOrigDatagramLen takes b as an original datagram,
+// and returns a required length for a padded original datagram in wire
+// format.
+func multipartMessageOrigDatagramLen(proto int, b []byte) int {
+	roundup := func(b []byte, align int) int {
+		// According to RFC 4884, the padded original datagram
+		// field must contain at least 128 octets.
+		if len(b) < 128 {
+			return 128
+		}
+		r := len(b)
+		return (r + align - 1) &^ (align - 1)
+	}
+	switch proto {
+	case iana.ProtocolICMP:
+		return roundup(b, 4)
+	case iana.ProtocolIPv6ICMP:
+		return roundup(b, 8)
+	default:
+		return len(b)
+	}
+}
+
+// marshalMultipartMessageBody takes data as an original datagram and
+// exts as extesnsions, and returns a binary encoding of message body.
+// It can be used for non-multipart message bodies when exts is nil.
+func marshalMultipartMessageBody(proto int, withOrigDgram bool, data []byte, exts []Extension) ([]byte, error) {
+	bodyLen, dataLen := multipartMessageBodyDataLen(proto, withOrigDgram, data, exts)
+	b := make([]byte, bodyLen)
+	copy(b[4:], data)
+	if len(exts) > 0 {
+		b[4+dataLen] = byte(extensionVersion << 4)
+		off := 4 + dataLen + 4 // leading octets, data, extension header
+		for _, ext := range exts {
+			switch ext := ext.(type) {
+			case *MPLSLabelStack:
+				if err := ext.marshal(proto, b[off:]); err != nil {
+					return nil, err
+				}
+				off += ext.Len(proto)
+			case *InterfaceInfo:
+				attrs, l := ext.attrsAndLen(proto)
+				if err := ext.marshal(proto, b[off:], attrs, l); err != nil {
+					return nil, err
+				}
+				off += ext.Len(proto)
+			case *InterfaceIdent:
+				if err := ext.marshal(proto, b[off:]); err != nil {
+					return nil, err
+				}
+				off += ext.Len(proto)
+			case *RawExtension:
+				copy(b[off:], ext.Data)
+				off += ext.Len(proto)
+			}
+		}
+		s := checksum(b[4+dataLen:])
+		b[4+dataLen+2] ^= byte(s)
+		b[4+dataLen+3] ^= byte(s >> 8)
+		if withOrigDgram {
+			switch proto {
+			case iana.ProtocolICMP:
+				b[1] = byte(dataLen / 4)
+			case iana.ProtocolIPv6ICMP:
+				b[0] = byte(dataLen / 8)
+			}
+		}
+	}
+	return b, nil
+}
+
+// parseMultipartMessageBody parses b as either a non-multipart
+// message body or a multipart message body.
+func parseMultipartMessageBody(proto int, typ Type, b []byte) ([]byte, []Extension, error) {
+	var l int
+	switch proto {
+	case iana.ProtocolICMP:
+		l = 4 * int(b[1])
+	case iana.ProtocolIPv6ICMP:
+		l = 8 * int(b[0])
+	}
+	if len(b) == 4 {
+		return nil, nil, nil
+	}
+	exts, l, err := parseExtensions(typ, b[4:], l)
+	if err != nil {
+		l = len(b) - 4
+	}
+	var data []byte
+	if l > 0 {
+		data = make([]byte, l)
+		copy(data, b[4:])
+	}
+	return data, exts, nil
+}

vendor/golang.org/x/net/icmp/packettoobig.go

@@ -0,0 +1,43 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import "encoding/binary"
+
+// A PacketTooBig represents an ICMP packet too big message body.
+type PacketTooBig struct {
+	MTU  int    // maximum transmission unit of the nexthop link
+	Data []byte // data, known as original datagram field
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *PacketTooBig) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	return 4 + len(p.Data)
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *PacketTooBig) Marshal(proto int) ([]byte, error) {
+	b := make([]byte, 4+len(p.Data))
+	binary.BigEndian.PutUint32(b[:4], uint32(p.MTU))
+	copy(b[4:], p.Data)
+	return b, nil
+}
+
+// parsePacketTooBig parses b as an ICMP packet too big message body.
+func parsePacketTooBig(proto int, _ Type, b []byte) (MessageBody, error) {
+	bodyLen := len(b)
+	if bodyLen < 4 {
+		return nil, errMessageTooShort
+	}
+	p := &PacketTooBig{MTU: int(binary.BigEndian.Uint32(b[:4]))}
+	if bodyLen > 4 {
+		p.Data = make([]byte, bodyLen-4)
+		copy(p.Data, b[4:])
+	}
+	return p, nil
+}

vendor/golang.org/x/net/icmp/paramprob.go

@@ -0,0 +1,72 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"encoding/binary"
+
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/ipv4"
+)
+
+// A ParamProb represents an ICMP parameter problem message body.
+type ParamProb struct {
+	Pointer    uintptr     // offset within the data where the error was detected
+	Data       []byte      // data, known as original datagram field
+	Extensions []Extension // extensions
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *ParamProb) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	l, _ := multipartMessageBodyDataLen(proto, true, p.Data, p.Extensions)
+	return l
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *ParamProb) Marshal(proto int) ([]byte, error) {
+	switch proto {
+	case iana.ProtocolICMP:
+		if !validExtensions(ipv4.ICMPTypeParameterProblem, p.Extensions) {
+			return nil, errInvalidExtension
+		}
+		b, err := marshalMultipartMessageBody(proto, true, p.Data, p.Extensions)
+		if err != nil {
+			return nil, err
+		}
+		b[0] = byte(p.Pointer)
+		return b, nil
+	case iana.ProtocolIPv6ICMP:
+		b := make([]byte, p.Len(proto))
+		binary.BigEndian.PutUint32(b[:4], uint32(p.Pointer))
+		copy(b[4:], p.Data)
+		return b, nil
+	default:
+		return nil, errInvalidProtocol
+	}
+}
+
+// parseParamProb parses b as an ICMP parameter problem message body.
+func parseParamProb(proto int, typ Type, b []byte) (MessageBody, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	p := &ParamProb{}
+	if proto == iana.ProtocolIPv6ICMP {
+		p.Pointer = uintptr(binary.BigEndian.Uint32(b[:4]))
+		p.Data = make([]byte, len(b)-4)
+		copy(p.Data, b[4:])
+		return p, nil
+	}
+	p.Pointer = uintptr(b[0])
+	var err error
+	p.Data, p.Extensions, err = parseMultipartMessageBody(proto, typ, b)
+	if err != nil {
+		return nil, err
+	}
+	return p, nil
+}

vendor/golang.org/x/net/icmp/sys_freebsd.go

@@ -0,0 +1,11 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import "syscall"
+
+func init() {
+	freebsdVersion, _ = syscall.SysctlUint32("kern.osreldate")
+}

vendor/golang.org/x/net/icmp/timeexceeded.go

@@ -0,0 +1,57 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package icmp
+
+import (
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+// A TimeExceeded represents an ICMP time exceeded message body.
+type TimeExceeded struct {
+	Data       []byte      // data, known as original datagram field
+	Extensions []Extension // extensions
+}
+
+// Len implements the Len method of MessageBody interface.
+func (p *TimeExceeded) Len(proto int) int {
+	if p == nil {
+		return 0
+	}
+	l, _ := multipartMessageBodyDataLen(proto, true, p.Data, p.Extensions)
+	return l
+}
+
+// Marshal implements the Marshal method of MessageBody interface.
+func (p *TimeExceeded) Marshal(proto int) ([]byte, error) {
+	var typ Type
+	switch proto {
+	case iana.ProtocolICMP:
+		typ = ipv4.ICMPTypeTimeExceeded
+	case iana.ProtocolIPv6ICMP:
+		typ = ipv6.ICMPTypeTimeExceeded
+	default:
+		return nil, errInvalidProtocol
+	}
+	if !validExtensions(typ, p.Extensions) {
+		return nil, errInvalidExtension
+	}
+	return marshalMultipartMessageBody(proto, true, p.Data, p.Extensions)
+}
+
+// parseTimeExceeded parses b as an ICMP time exceeded message body.
+func parseTimeExceeded(proto int, typ Type, b []byte) (MessageBody, error) {
+	if len(b) < 4 {
+		return nil, errMessageTooShort
+	}
+	p := &TimeExceeded{}
+	var err error
+	p.Data, p.Extensions, err = parseMultipartMessageBody(proto, typ, b)
+	if err != nil {
+		return nil, err
+	}
+	return p, nil
+}

vendor/golang.org/x/net/internal/iana/const.go

@@ -0,0 +1,223 @@
+// go generate gen.go
+// Code generated by the command above; DO NOT EDIT.
+
+// Package iana provides protocol number resources managed by the Internet Assigned Numbers Authority (IANA).
+package iana // import "golang.org/x/net/internal/iana"
+
+// Differentiated Services Field Codepoints (DSCP), Updated: 2018-05-04
+const (
+	DiffServCS0           = 0x00 // CS0
+	DiffServCS1           = 0x20 // CS1
+	DiffServCS2           = 0x40 // CS2
+	DiffServCS3           = 0x60 // CS3
+	DiffServCS4           = 0x80 // CS4
+	DiffServCS5           = 0xa0 // CS5
+	DiffServCS6           = 0xc0 // CS6
+	DiffServCS7           = 0xe0 // CS7
+	DiffServAF11          = 0x28 // AF11
+	DiffServAF12          = 0x30 // AF12
+	DiffServAF13          = 0x38 // AF13
+	DiffServAF21          = 0x48 // AF21
+	DiffServAF22          = 0x50 // AF22
+	DiffServAF23          = 0x58 // AF23
+	DiffServAF31          = 0x68 // AF31
+	DiffServAF32          = 0x70 // AF32
+	DiffServAF33          = 0x78 // AF33
+	DiffServAF41          = 0x88 // AF41
+	DiffServAF42          = 0x90 // AF42
+	DiffServAF43          = 0x98 // AF43
+	DiffServEF            = 0xb8 // EF
+	DiffServVOICEADMIT    = 0xb0 // VOICE-ADMIT
+	NotECNTransport       = 0x00 // Not-ECT (Not ECN-Capable Transport)
+	ECNTransport1         = 0x01 // ECT(1) (ECN-Capable Transport(1))
+	ECNTransport0         = 0x02 // ECT(0) (ECN-Capable Transport(0))
+	CongestionExperienced = 0x03 // CE (Congestion Experienced)
+)
+
+// Protocol Numbers, Updated: 2017-10-13
+const (
+	ProtocolIP             = 0   // IPv4 encapsulation, pseudo protocol number
+	ProtocolHOPOPT         = 0   // IPv6 Hop-by-Hop Option
+	ProtocolICMP           = 1   // Internet Control Message
+	ProtocolIGMP           = 2   // Internet Group Management
+	ProtocolGGP            = 3   // Gateway-to-Gateway
+	ProtocolIPv4           = 4   // IPv4 encapsulation
+	ProtocolST             = 5   // Stream
+	ProtocolTCP            = 6   // Transmission Control
+	ProtocolCBT            = 7   // CBT
+	ProtocolEGP            = 8   // Exterior Gateway Protocol
+	ProtocolIGP            = 9   // any private interior gateway (used by Cisco for their IGRP)
+	ProtocolBBNRCCMON      = 10  // BBN RCC Monitoring
+	ProtocolNVPII          = 11  // Network Voice Protocol
+	ProtocolPUP            = 12  // PUP
+	ProtocolEMCON          = 14  // EMCON
+	ProtocolXNET           = 15  // Cross Net Debugger
+	ProtocolCHAOS          = 16  // Chaos
+	ProtocolUDP            = 17  // User Datagram
+	ProtocolMUX            = 18  // Multiplexing
+	ProtocolDCNMEAS        = 19  // DCN Measurement Subsystems
+	ProtocolHMP            = 20  // Host Monitoring
+	ProtocolPRM            = 21  // Packet Radio Measurement
+	ProtocolXNSIDP         = 22  // XEROX NS IDP
+	ProtocolTRUNK1         = 23  // Trunk-1
+	ProtocolTRUNK2         = 24  // Trunk-2
+	ProtocolLEAF1          = 25  // Leaf-1
+	ProtocolLEAF2          = 26  // Leaf-2
+	ProtocolRDP            = 27  // Reliable Data Protocol
+	ProtocolIRTP           = 28  // Internet Reliable Transaction
+	ProtocolISOTP4         = 29  // ISO Transport Protocol Class 4
+	ProtocolNETBLT         = 30  // Bulk Data Transfer Protocol
+	ProtocolMFENSP         = 31  // MFE Network Services Protocol
+	ProtocolMERITINP       = 32  // MERIT Internodal Protocol
+	ProtocolDCCP           = 33  // Datagram Congestion Control Protocol
+	Protocol3PC            = 34  // Third Party Connect Protocol
+	ProtocolIDPR           = 35  // Inter-Domain Policy Routing Protocol
+	ProtocolXTP            = 36  // XTP
+	ProtocolDDP            = 37  // Datagram Delivery Protocol
+	ProtocolIDPRCMTP       = 38  // IDPR Control Message Transport Proto
+	ProtocolTPPP           = 39  // TP++ Transport Protocol
+	ProtocolIL             = 40  // IL Transport Protocol
+	ProtocolIPv6           = 41  // IPv6 encapsulation
+	ProtocolSDRP           = 42  // Source Demand Routing Protocol
+	ProtocolIPv6Route      = 43  // Routing Header for IPv6
+	ProtocolIPv6Frag       = 44  // Fragment Header for IPv6
+	ProtocolIDRP           = 45  // Inter-Domain Routing Protocol
+	ProtocolRSVP           = 46  // Reservation Protocol
+	ProtocolGRE            = 47  // Generic Routing Encapsulation
+	ProtocolDSR            = 48  // Dynamic Source Routing Protocol
+	ProtocolBNA            = 49  // BNA
+	ProtocolESP            = 50  // Encap Security Payload
+	ProtocolAH             = 51  // Authentication Header
+	ProtocolINLSP          = 52  // Integrated Net Layer Security  TUBA
+	ProtocolNARP           = 54  // NBMA Address Resolution Protocol
+	ProtocolMOBILE         = 55  // IP Mobility
+	ProtocolTLSP           = 56  // Transport Layer Security Protocol using Kryptonet key management
+	ProtocolSKIP           = 57  // SKIP
+	ProtocolIPv6ICMP       = 58  // ICMP for IPv6
+	ProtocolIPv6NoNxt      = 59  // No Next Header for IPv6
+	ProtocolIPv6Opts       = 60  // Destination Options for IPv6
+	ProtocolCFTP           = 62  // CFTP
+	ProtocolSATEXPAK       = 64  // SATNET and Backroom EXPAK
+	ProtocolKRYPTOLAN      = 65  // Kryptolan
+	ProtocolRVD            = 66  // MIT Remote Virtual Disk Protocol
+	ProtocolIPPC           = 67  // Internet Pluribus Packet Core
+	ProtocolSATMON         = 69  // SATNET Monitoring
+	ProtocolVISA           = 70  // VISA Protocol
+	ProtocolIPCV           = 71  // Internet Packet Core Utility
+	ProtocolCPNX           = 72  // Computer Protocol Network Executive
+	ProtocolCPHB           = 73  // Computer Protocol Heart Beat
+	ProtocolWSN            = 74  // Wang Span Network
+	ProtocolPVP            = 75  // Packet Video Protocol
+	ProtocolBRSATMON       = 76  // Backroom SATNET Monitoring
+	ProtocolSUNND          = 77  // SUN ND PROTOCOL-Temporary
+	ProtocolWBMON          = 78  // WIDEBAND Monitoring
+	ProtocolWBEXPAK        = 79  // WIDEBAND EXPAK
+	ProtocolISOIP          = 80  // ISO Internet Protocol
+	ProtocolVMTP           = 81  // VMTP
+	ProtocolSECUREVMTP     = 82  // SECURE-VMTP
+	ProtocolVINES          = 83  // VINES
+	ProtocolTTP            = 84  // Transaction Transport Protocol
+	ProtocolIPTM           = 84  // Internet Protocol Traffic Manager
+	ProtocolNSFNETIGP      = 85  // NSFNET-IGP
+	ProtocolDGP            = 86  // Dissimilar Gateway Protocol
+	ProtocolTCF            = 87  // TCF
+	ProtocolEIGRP          = 88  // EIGRP
+	ProtocolOSPFIGP        = 89  // OSPFIGP
+	ProtocolSpriteRPC      = 90  // Sprite RPC Protocol
+	ProtocolLARP           = 91  // Locus Address Resolution Protocol
+	ProtocolMTP            = 92  // Multicast Transport Protocol
+	ProtocolAX25           = 93  // AX.25 Frames
+	ProtocolIPIP           = 94  // IP-within-IP Encapsulation Protocol
+	ProtocolSCCSP          = 96  // Semaphore Communications Sec. Pro.
+	ProtocolETHERIP        = 97  // Ethernet-within-IP Encapsulation
+	ProtocolENCAP          = 98  // Encapsulation Header
+	ProtocolGMTP           = 100 // GMTP
+	ProtocolIFMP           = 101 // Ipsilon Flow Management Protocol
+	ProtocolPNNI           = 102 // PNNI over IP
+	ProtocolPIM            = 103 // Protocol Independent Multicast
+	ProtocolARIS           = 104 // ARIS
+	ProtocolSCPS           = 105 // SCPS
+	ProtocolQNX            = 106 // QNX
+	ProtocolAN             = 107 // Active Networks
+	ProtocolIPComp         = 108 // IP Payload Compression Protocol
+	ProtocolSNP            = 109 // Sitara Networks Protocol
+	ProtocolCompaqPeer     = 110 // Compaq Peer Protocol
+	ProtocolIPXinIP        = 111 // IPX in IP
+	ProtocolVRRP           = 112 // Virtual Router Redundancy Protocol
+	ProtocolPGM            = 113 // PGM Reliable Transport Protocol
+	ProtocolL2TP           = 115 // Layer Two Tunneling Protocol
+	ProtocolDDX            = 116 // D-II Data Exchange (DDX)
+	ProtocolIATP           = 117 // Interactive Agent Transfer Protocol
+	ProtocolSTP            = 118 // Schedule Transfer Protocol
+	ProtocolSRP            = 119 // SpectraLink Radio Protocol
+	ProtocolUTI            = 120 // UTI
+	ProtocolSMP            = 121 // Simple Message Protocol
+	ProtocolPTP            = 123 // Performance Transparency Protocol
+	ProtocolISIS           = 124 // ISIS over IPv4
+	ProtocolFIRE           = 125 // FIRE
+	ProtocolCRTP           = 126 // Combat Radio Transport Protocol
+	ProtocolCRUDP          = 127 // Combat Radio User Datagram
+	ProtocolSSCOPMCE       = 128 // SSCOPMCE
+	ProtocolIPLT           = 129 // IPLT
+	ProtocolSPS            = 130 // Secure Packet Shield
+	ProtocolPIPE           = 131 // Private IP Encapsulation within IP
+	ProtocolSCTP           = 132 // Stream Control Transmission Protocol
+	ProtocolFC             = 133 // Fibre Channel
+	ProtocolRSVPE2EIGNORE  = 134 // RSVP-E2E-IGNORE
+	ProtocolMobilityHeader = 135 // Mobility Header
+	ProtocolUDPLite        = 136 // UDPLite
+	ProtocolMPLSinIP       = 137 // MPLS-in-IP
+	ProtocolMANET          = 138 // MANET Protocols
+	ProtocolHIP            = 139 // Host Identity Protocol
+	ProtocolShim6          = 140 // Shim6 Protocol
+	ProtocolWESP           = 141 // Wrapped Encapsulating Security Payload
+	ProtocolROHC           = 142 // Robust Header Compression
+	ProtocolReserved       = 255 // Reserved
+)
+
+// Address Family Numbers, Updated: 2018-04-02
+const (
+	AddrFamilyIPv4                          = 1     // IP (IP version 4)
+	AddrFamilyIPv6                          = 2     // IP6 (IP version 6)
+	AddrFamilyNSAP                          = 3     // NSAP
+	AddrFamilyHDLC                          = 4     // HDLC (8-bit multidrop)
+	AddrFamilyBBN1822                       = 5     // BBN 1822
+	AddrFamily802                           = 6     // 802 (includes all 802 media plus Ethernet "canonical format")
+	AddrFamilyE163                          = 7     // E.163
+	AddrFamilyE164                          = 8     // E.164 (SMDS, Frame Relay, ATM)
+	AddrFamilyF69                           = 9     // F.69 (Telex)
+	AddrFamilyX121                          = 10    // X.121 (X.25, Frame Relay)
+	AddrFamilyIPX                           = 11    // IPX
+	AddrFamilyAppletalk                     = 12    // Appletalk
+	AddrFamilyDecnetIV                      = 13    // Decnet IV
+	AddrFamilyBanyanVines                   = 14    // Banyan Vines
+	AddrFamilyE164withSubaddress            = 15    // E.164 with NSAP format subaddress
+	AddrFamilyDNS                           = 16    // DNS (Domain Name System)
+	AddrFamilyDistinguishedName             = 17    // Distinguished Name
+	AddrFamilyASNumber                      = 18    // AS Number
+	AddrFamilyXTPoverIPv4                   = 19    // XTP over IP version 4
+	AddrFamilyXTPoverIPv6                   = 20    // XTP over IP version 6
+	AddrFamilyXTPnativemodeXTP              = 21    // XTP native mode XTP
+	AddrFamilyFibreChannelWorldWidePortName = 22    // Fibre Channel World-Wide Port Name
+	AddrFamilyFibreChannelWorldWideNodeName = 23    // Fibre Channel World-Wide Node Name
+	AddrFamilyGWID                          = 24    // GWID
+	AddrFamilyL2VPN                         = 25    // AFI for L2VPN information
+	AddrFamilyMPLSTPSectionEndpointID       = 26    // MPLS-TP Section Endpoint Identifier
+	AddrFamilyMPLSTPLSPEndpointID           = 27    // MPLS-TP LSP Endpoint Identifier
+	AddrFamilyMPLSTPPseudowireEndpointID    = 28    // MPLS-TP Pseudowire Endpoint Identifier
+	AddrFamilyMTIPv4                        = 29    // MT IP: Multi-Topology IP version 4
+	AddrFamilyMTIPv6                        = 30    // MT IPv6: Multi-Topology IP version 6
+	AddrFamilyEIGRPCommonServiceFamily      = 16384 // EIGRP Common Service Family
+	AddrFamilyEIGRPIPv4ServiceFamily        = 16385 // EIGRP IPv4 Service Family
+	AddrFamilyEIGRPIPv6ServiceFamily        = 16386 // EIGRP IPv6 Service Family
+	AddrFamilyLISPCanonicalAddressFormat    = 16387 // LISP Canonical Address Format (LCAF)
+	AddrFamilyBGPLS                         = 16388 // BGP-LS
+	AddrFamily48bitMAC                      = 16389 // 48-bit MAC
+	AddrFamily64bitMAC                      = 16390 // 64-bit MAC
+	AddrFamilyOUI                           = 16391 // OUI
+	AddrFamilyMACFinal24bits                = 16392 // MAC/24
+	AddrFamilyMACFinal40bits                = 16393 // MAC/40
+	AddrFamilyIPv6Initial64bits             = 16394 // IPv6/64
+	AddrFamilyRBridgePortID                 = 16395 // RBridge Port ID
+	AddrFamilyTRILLNickname                 = 16396 // TRILL Nickname
+)

vendor/golang.org/x/net/internal/socket/cmsghdr.go

@@ -0,0 +1,11 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+
+package socket
+
+func (h *cmsghdr) len() int { return int(h.Len) }
+func (h *cmsghdr) lvl() int { return int(h.Level) }
+func (h *cmsghdr) typ() int { return int(h.Type) }

vendor/golang.org/x/net/internal/socket/cmsghdr_bsd.go

@@ -0,0 +1,13 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
+
+package socket
+
+func (h *cmsghdr) set(l, lvl, typ int) {
+	h.Len = uint32(l)
+	h.Level = int32(lvl)
+	h.Type = int32(typ)
+}

vendor/golang.org/x/net/internal/socket/cmsghdr_linux_32bit.go

@@ -0,0 +1,13 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (arm || mips || mipsle || 386 || ppc) && linux
+
+package socket
+
+func (h *cmsghdr) set(l, lvl, typ int) {
+	h.Len = uint32(l)
+	h.Level = int32(lvl)
+	h.Type = int32(typ)
+}

vendor/golang.org/x/net/internal/socket/cmsghdr_linux_64bit.go

@@ -0,0 +1,13 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (arm64 || amd64 || loong64 || ppc64 || ppc64le || mips64 || mips64le || riscv64 || s390x) && linux
+
+package socket
+
+func (h *cmsghdr) set(l, lvl, typ int) {
+	h.Len = uint64(l)
+	h.Level = int32(lvl)
+	h.Type = int32(typ)
+}

vendor/golang.org/x/net/internal/socket/cmsghdr_solaris_64bit.go

@@ -0,0 +1,13 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build amd64 && solaris
+
+package socket
+
+func (h *cmsghdr) set(l, lvl, typ int) {
+	h.Len = uint32(l)
+	h.Level = int32(lvl)
+	h.Type = int32(typ)
+}

vendor/golang.org/x/net/internal/socket/cmsghdr_stub.go

@@ -0,0 +1,27 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+
+package socket
+
+func controlHeaderLen() int {
+	return 0
+}
+
+func controlMessageLen(dataLen int) int {
+	return 0
+}
+
+func controlMessageSpace(dataLen int) int {
+	return 0
+}
+
+type cmsghdr struct{}
+
+func (h *cmsghdr) len() int { return 0 }
+func (h *cmsghdr) lvl() int { return 0 }
+func (h *cmsghdr) typ() int { return 0 }
+
+func (h *cmsghdr) set(l, lvl, typ int) {}

vendor/golang.org/x/net/internal/socket/cmsghdr_unix.go

@@ -0,0 +1,21 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+
+package socket
+
+import "golang.org/x/sys/unix"
+
+func controlHeaderLen() int {
+	return unix.CmsgLen(0)
+}
+
+func controlMessageLen(dataLen int) int {
+	return unix.CmsgLen(dataLen)
+}
+
+func controlMessageSpace(dataLen int) int {
+	return unix.CmsgSpace(dataLen)
+}

vendor/golang.org/x/net/internal/socket/cmsghdr_zos_s390x.go

@@ -0,0 +1,11 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+func (h *cmsghdr) set(l, lvl, typ int) {
+	h.Len = int32(l)
+	h.Level = int32(lvl)
+	h.Type = int32(typ)
+}

vendor/golang.org/x/net/internal/socket/complete_dontwait.go

@@ -0,0 +1,25 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
+
+package socket
+
+import (
+	"syscall"
+)
+
+// ioComplete checks the flags and result of a syscall, to be used as return
+// value in a syscall.RawConn.Read or Write callback.
+func ioComplete(flags int, operr error) bool {
+	if flags&syscall.MSG_DONTWAIT != 0 {
+		// Caller explicitly said don't wait, so always return immediately.
+		return true
+	}
+	if operr == syscall.EAGAIN || operr == syscall.EWOULDBLOCK {
+		// No data available, block for I/O and try again.
+		return false
+	}
+	return true
+}

vendor/golang.org/x/net/internal/socket/complete_nodontwait.go

@@ -0,0 +1,21 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || windows || zos
+
+package socket
+
+import (
+	"syscall"
+)
+
+// ioComplete checks the flags and result of a syscall, to be used as return
+// value in a syscall.RawConn.Read or Write callback.
+func ioComplete(flags int, operr error) bool {
+	if operr == syscall.EAGAIN || operr == syscall.EWOULDBLOCK {
+		// No data available, block for I/O and try again.
+		return false
+	}
+	return true
+}

vendor/golang.org/x/net/internal/socket/empty.s

@@ -0,0 +1,7 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin && go1.12
+
+// This exists solely so we can linkname in symbols from syscall.

vendor/golang.org/x/net/internal/socket/error_unix.go

@@ -0,0 +1,31 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+
+package socket
+
+import "syscall"
+
+var (
+	errEAGAIN error = syscall.EAGAIN
+	errEINVAL error = syscall.EINVAL
+	errENOENT error = syscall.ENOENT
+)
+
+// errnoErr returns common boxed Errno values, to prevent allocations
+// at runtime.
+func errnoErr(errno syscall.Errno) error {
+	switch errno {
+	case 0:
+		return nil
+	case syscall.EAGAIN:
+		return errEAGAIN
+	case syscall.EINVAL:
+		return errEINVAL
+	case syscall.ENOENT:
+		return errENOENT
+	}
+	return errno
+}

vendor/golang.org/x/net/internal/socket/error_windows.go

@@ -0,0 +1,26 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+import "syscall"
+
+var (
+	errERROR_IO_PENDING error = syscall.ERROR_IO_PENDING
+	errEINVAL           error = syscall.EINVAL
+)
+
+// errnoErr returns common boxed Errno values, to prevent allocations
+// at runtime.
+func errnoErr(errno syscall.Errno) error {
+	switch errno {
+	case 0:
+		return nil
+	case syscall.ERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	case syscall.EINVAL:
+		return errEINVAL
+	}
+	return errno
+}

vendor/golang.org/x/net/internal/socket/iovec_32bit.go

@@ -0,0 +1,18 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (arm || mips || mipsle || 386 || ppc) && (darwin || dragonfly || freebsd || linux || netbsd || openbsd)
+
+package socket
+
+import "unsafe"
+
+func (v *iovec) set(b []byte) {
+	l := len(b)
+	if l == 0 {
+		return
+	}
+	v.Base = (*byte)(unsafe.Pointer(&b[0]))
+	v.Len = uint32(l)
+}

vendor/golang.org/x/net/internal/socket/iovec_64bit.go

@@ -0,0 +1,18 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (arm64 || amd64 || loong64 || ppc64 || ppc64le || mips64 || mips64le || riscv64 || s390x) && (aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || zos)
+
+package socket
+
+import "unsafe"
+
+func (v *iovec) set(b []byte) {
+	l := len(b)
+	if l == 0 {
+		return
+	}
+	v.Base = (*byte)(unsafe.Pointer(&b[0]))
+	v.Len = uint64(l)
+}

vendor/golang.org/x/net/internal/socket/iovec_solaris_64bit.go

@@ -0,0 +1,18 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build amd64 && solaris
+
+package socket
+
+import "unsafe"
+
+func (v *iovec) set(b []byte) {
+	l := len(b)
+	if l == 0 {
+		return
+	}
+	v.Base = (*int8)(unsafe.Pointer(&b[0]))
+	v.Len = uint64(l)
+}

vendor/golang.org/x/net/internal/socket/iovec_stub.go

@@ -0,0 +1,11 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+
+package socket
+
+type iovec struct{}
+
+func (v *iovec) set(b []byte) {}

vendor/golang.org/x/net/internal/socket/mmsghdr_stub.go

@@ -0,0 +1,21 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !aix && !linux && !netbsd
+
+package socket
+
+import "net"
+
+type mmsghdr struct{}
+
+type mmsghdrs []mmsghdr
+
+func (hs mmsghdrs) pack(ms []Message, parseFn func([]byte, string) (net.Addr, error), marshalFn func(net.Addr) []byte) error {
+	return nil
+}
+
+func (hs mmsghdrs) unpack(ms []Message, parseFn func([]byte, string) (net.Addr, error), hint string) error {
+	return nil
+}

vendor/golang.org/x/net/internal/socket/mmsghdr_unix.go

@@ -0,0 +1,195 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || linux || netbsd
+
+package socket
+
+import (
+	"net"
+	"os"
+	"sync"
+	"syscall"
+)
+
+type mmsghdrs []mmsghdr
+
+func (hs mmsghdrs) unpack(ms []Message, parseFn func([]byte, string) (net.Addr, error), hint string) error {
+	for i := range hs {
+		ms[i].N = int(hs[i].Len)
+		ms[i].NN = hs[i].Hdr.controllen()
+		ms[i].Flags = hs[i].Hdr.flags()
+		if parseFn != nil {
+			var err error
+			ms[i].Addr, err = parseFn(hs[i].Hdr.name(), hint)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+// mmsghdrsPacker packs Message-slices into mmsghdrs (re-)using pre-allocated buffers.
+type mmsghdrsPacker struct {
+	// hs are the pre-allocated mmsghdrs.
+	hs mmsghdrs
+	// sockaddrs is the pre-allocated buffer for the Hdr.Name buffers.
+	// We use one large buffer for all messages and slice it up.
+	sockaddrs []byte
+	// vs are the pre-allocated iovecs.
+	// We allocate one large buffer for all messages and slice it up. This allows to reuse the buffer
+	// if the number of buffers per message is distributed differently between calls.
+	vs []iovec
+}
+
+func (p *mmsghdrsPacker) prepare(ms []Message) {
+	n := len(ms)
+	if n <= cap(p.hs) {
+		p.hs = p.hs[:n]
+	} else {
+		p.hs = make(mmsghdrs, n)
+	}
+	if n*sizeofSockaddrInet6 <= cap(p.sockaddrs) {
+		p.sockaddrs = p.sockaddrs[:n*sizeofSockaddrInet6]
+	} else {
+		p.sockaddrs = make([]byte, n*sizeofSockaddrInet6)
+	}
+
+	nb := 0
+	for _, m := range ms {
+		nb += len(m.Buffers)
+	}
+	if nb <= cap(p.vs) {
+		p.vs = p.vs[:nb]
+	} else {
+		p.vs = make([]iovec, nb)
+	}
+}
+
+func (p *mmsghdrsPacker) pack(ms []Message, parseFn func([]byte, string) (net.Addr, error), marshalFn func(net.Addr, []byte) int) mmsghdrs {
+	p.prepare(ms)
+	hs := p.hs
+	vsRest := p.vs
+	saRest := p.sockaddrs
+	for i := range hs {
+		nvs := len(ms[i].Buffers)
+		vs := vsRest[:nvs]
+		vsRest = vsRest[nvs:]
+
+		var sa []byte
+		if parseFn != nil {
+			sa = saRest[:sizeofSockaddrInet6]
+			saRest = saRest[sizeofSockaddrInet6:]
+		} else if marshalFn != nil {
+			n := marshalFn(ms[i].Addr, saRest)
+			if n > 0 {
+				sa = saRest[:n]
+				saRest = saRest[n:]
+			}
+		}
+		hs[i].Hdr.pack(vs, ms[i].Buffers, ms[i].OOB, sa)
+	}
+	return hs
+}
+
+// syscaller is a helper to invoke recvmmsg and sendmmsg via the RawConn.Read/Write interface.
+// It is reusable, to amortize the overhead of allocating a closure for the function passed to
+// RawConn.Read/Write.
+type syscaller struct {
+	n     int
+	operr error
+	hs    mmsghdrs
+	flags int
+
+	boundRecvmmsgF func(uintptr) bool
+	boundSendmmsgF func(uintptr) bool
+}
+
+func (r *syscaller) init() {
+	r.boundRecvmmsgF = r.recvmmsgF
+	r.boundSendmmsgF = r.sendmmsgF
+}
+
+func (r *syscaller) recvmmsg(c syscall.RawConn, hs mmsghdrs, flags int) (int, error) {
+	r.n = 0
+	r.operr = nil
+	r.hs = hs
+	r.flags = flags
+	if err := c.Read(r.boundRecvmmsgF); err != nil {
+		return r.n, err
+	}
+	if r.operr != nil {
+		return r.n, os.NewSyscallError("recvmmsg", r.operr)
+	}
+	return r.n, nil
+}
+
+func (r *syscaller) recvmmsgF(s uintptr) bool {
+	r.n, r.operr = recvmmsg(s, r.hs, r.flags)
+	return ioComplete(r.flags, r.operr)
+}
+
+func (r *syscaller) sendmmsg(c syscall.RawConn, hs mmsghdrs, flags int) (int, error) {
+	r.n = 0
+	r.operr = nil
+	r.hs = hs
+	r.flags = flags
+	if err := c.Write(r.boundSendmmsgF); err != nil {
+		return r.n, err
+	}
+	if r.operr != nil {
+		return r.n, os.NewSyscallError("sendmmsg", r.operr)
+	}
+	return r.n, nil
+}
+
+func (r *syscaller) sendmmsgF(s uintptr) bool {
+	r.n, r.operr = sendmmsg(s, r.hs, r.flags)
+	return ioComplete(r.flags, r.operr)
+}
+
+// mmsgTmps holds reusable temporary helpers for recvmmsg and sendmmsg.
+type mmsgTmps struct {
+	packer    mmsghdrsPacker
+	syscaller syscaller
+}
+
+var defaultMmsgTmpsPool = mmsgTmpsPool{
+	p: sync.Pool{
+		New: func() interface{} {
+			tmps := new(mmsgTmps)
+			tmps.syscaller.init()
+			return tmps
+		},
+	},
+}
+
+type mmsgTmpsPool struct {
+	p sync.Pool
+}
+
+func (p *mmsgTmpsPool) Get() *mmsgTmps {
+	m := p.p.Get().(*mmsgTmps)
+	// Clear fields up to the len (not the cap) of the slice,
+	// assuming that the previous caller only used that many elements.
+	for i := range m.packer.sockaddrs {
+		m.packer.sockaddrs[i] = 0
+	}
+	m.packer.sockaddrs = m.packer.sockaddrs[:0]
+	for i := range m.packer.vs {
+		m.packer.vs[i] = iovec{}
+	}
+	m.packer.vs = m.packer.vs[:0]
+	for i := range m.packer.hs {
+		m.packer.hs[i].Len = 0
+		m.packer.hs[i].Hdr = msghdr{}
+	}
+	m.packer.hs = m.packer.hs[:0]
+	return m
+}
+
+func (p *mmsgTmpsPool) Put(tmps *mmsgTmps) {
+	p.p.Put(tmps)
+}

vendor/golang.org/x/net/internal/socket/msghdr_bsd.go

@@ -0,0 +1,39 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
+
+package socket
+
+import "unsafe"
+
+func (h *msghdr) pack(vs []iovec, bs [][]byte, oob []byte, sa []byte) {
+	for i := range vs {
+		vs[i].set(bs[i])
+	}
+	h.setIov(vs)
+	if len(oob) > 0 {
+		h.Control = (*byte)(unsafe.Pointer(&oob[0]))
+		h.Controllen = uint32(len(oob))
+	}
+	if sa != nil {
+		h.Name = (*byte)(unsafe.Pointer(&sa[0]))
+		h.Namelen = uint32(len(sa))
+	}
+}
+
+func (h *msghdr) name() []byte {
+	if h.Name != nil && h.Namelen > 0 {
+		return (*[sizeofSockaddrInet6]byte)(unsafe.Pointer(h.Name))[:h.Namelen]
+	}
+	return nil
+}
+
+func (h *msghdr) controllen() int {
+	return int(h.Controllen)
+}
+
+func (h *msghdr) flags() int {
+	return int(h.Flags)
+}

vendor/golang.org/x/net/internal/socket/msghdr_bsdvar.go

@@ -0,0 +1,16 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || netbsd
+
+package socket
+
+func (h *msghdr) setIov(vs []iovec) {
+	l := len(vs)
+	if l == 0 {
+		return
+	}
+	h.Iov = &vs[0]
+	h.Iovlen = int32(l)
+}

vendor/golang.org/x/net/internal/socket/msghdr_linux.go

@@ -0,0 +1,36 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+import "unsafe"
+
+func (h *msghdr) pack(vs []iovec, bs [][]byte, oob []byte, sa []byte) {
+	for i := range vs {
+		vs[i].set(bs[i])
+	}
+	h.setIov(vs)
+	if len(oob) > 0 {
+		h.setControl(oob)
+	}
+	if sa != nil {
+		h.Name = (*byte)(unsafe.Pointer(&sa[0]))
+		h.Namelen = uint32(len(sa))
+	}
+}
+
+func (h *msghdr) name() []byte {
+	if h.Name != nil && h.Namelen > 0 {
+		return (*[sizeofSockaddrInet6]byte)(unsafe.Pointer(h.Name))[:h.Namelen]
+	}
+	return nil
+}
+
+func (h *msghdr) controllen() int {
+	return int(h.Controllen)
+}
+
+func (h *msghdr) flags() int {
+	return int(h.Flags)
+}

vendor/golang.org/x/net/internal/socket/msghdr_linux_32bit.go

@@ -0,0 +1,23 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (arm || mips || mipsle || 386 || ppc) && linux
+
+package socket
+
+import "unsafe"
+
+func (h *msghdr) setIov(vs []iovec) {
+	l := len(vs)
+	if l == 0 {
+		return
+	}
+	h.Iov = &vs[0]
+	h.Iovlen = uint32(l)
+}
+
+func (h *msghdr) setControl(b []byte) {
+	h.Control = (*byte)(unsafe.Pointer(&b[0]))
+	h.Controllen = uint32(len(b))
+}

vendor/golang.org/x/net/internal/socket/msghdr_linux_64bit.go

@@ -0,0 +1,23 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (arm64 || amd64 || loong64 || ppc64 || ppc64le || mips64 || mips64le || riscv64 || s390x) && linux
+
+package socket
+
+import "unsafe"
+
+func (h *msghdr) setIov(vs []iovec) {
+	l := len(vs)
+	if l == 0 {
+		return
+	}
+	h.Iov = &vs[0]
+	h.Iovlen = uint64(l)
+}
+
+func (h *msghdr) setControl(b []byte) {
+	h.Control = (*byte)(unsafe.Pointer(&b[0]))
+	h.Controllen = uint64(len(b))
+}

vendor/golang.org/x/net/internal/socket/msghdr_openbsd.go

@@ -0,0 +1,14 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+func (h *msghdr) setIov(vs []iovec) {
+	l := len(vs)
+	if l == 0 {
+		return
+	}
+	h.Iov = &vs[0]
+	h.Iovlen = uint32(l)
+}

vendor/golang.org/x/net/internal/socket/msghdr_solaris_64bit.go

@@ -0,0 +1,35 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build amd64 && solaris
+
+package socket
+
+import "unsafe"
+
+func (h *msghdr) pack(vs []iovec, bs [][]byte, oob []byte, sa []byte) {
+	for i := range vs {
+		vs[i].set(bs[i])
+	}
+	if len(vs) > 0 {
+		h.Iov = &vs[0]
+		h.Iovlen = int32(len(vs))
+	}
+	if len(oob) > 0 {
+		h.Accrights = (*int8)(unsafe.Pointer(&oob[0]))
+		h.Accrightslen = int32(len(oob))
+	}
+	if sa != nil {
+		h.Name = (*byte)(unsafe.Pointer(&sa[0]))
+		h.Namelen = uint32(len(sa))
+	}
+}
+
+func (h *msghdr) controllen() int {
+	return int(h.Accrightslen)
+}
+
+func (h *msghdr) flags() int {
+	return int(NativeEndian.Uint32(h.Pad_cgo_2[:]))
+}

vendor/golang.org/x/net/internal/socket/msghdr_stub.go

@@ -0,0 +1,14 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+
+package socket
+
+type msghdr struct{}
+
+func (h *msghdr) pack(vs []iovec, bs [][]byte, oob []byte, sa []byte) {}
+func (h *msghdr) name() []byte                                        { return nil }
+func (h *msghdr) controllen() int                                     { return 0 }
+func (h *msghdr) flags() int                                          { return 0 }

vendor/golang.org/x/net/internal/socket/msghdr_zos_s390x.go

@@ -0,0 +1,35 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build s390x && zos
+
+package socket
+
+import "unsafe"
+
+func (h *msghdr) pack(vs []iovec, bs [][]byte, oob []byte, sa []byte) {
+	for i := range vs {
+		vs[i].set(bs[i])
+	}
+	if len(vs) > 0 {
+		h.Iov = &vs[0]
+		h.Iovlen = int32(len(vs))
+	}
+	if len(oob) > 0 {
+		h.Control = (*byte)(unsafe.Pointer(&oob[0]))
+		h.Controllen = uint32(len(oob))
+	}
+	if sa != nil {
+		h.Name = (*byte)(unsafe.Pointer(&sa[0]))
+		h.Namelen = uint32(len(sa))
+	}
+}
+
+func (h *msghdr) controllen() int {
+	return int(h.Controllen)
+}
+
+func (h *msghdr) flags() int {
+	return int(h.Flags)
+}

vendor/golang.org/x/net/internal/socket/norace.go

@@ -0,0 +1,12 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !race
+
+package socket
+
+func (m *Message) raceRead() {
+}
+func (m *Message) raceWrite() {
+}

vendor/golang.org/x/net/internal/socket/race.go

@@ -0,0 +1,37 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build race
+
+package socket
+
+import (
+	"runtime"
+	"unsafe"
+)
+
+// This package reads and writes the Message buffers using a
+// direct system call, which the race detector can't see.
+// These functions tell the race detector what is going on during the syscall.
+
+func (m *Message) raceRead() {
+	for _, b := range m.Buffers {
+		if len(b) > 0 {
+			runtime.RaceReadRange(unsafe.Pointer(&b[0]), len(b))
+		}
+	}
+	if b := m.OOB; len(b) > 0 {
+		runtime.RaceReadRange(unsafe.Pointer(&b[0]), len(b))
+	}
+}
+func (m *Message) raceWrite() {
+	for _, b := range m.Buffers {
+		if len(b) > 0 {
+			runtime.RaceWriteRange(unsafe.Pointer(&b[0]), len(b))
+		}
+	}
+	if b := m.OOB; len(b) > 0 {
+		runtime.RaceWriteRange(unsafe.Pointer(&b[0]), len(b))
+	}
+}

vendor/golang.org/x/net/internal/socket/rawconn.go

@@ -0,0 +1,91 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+import (
+	"errors"
+	"net"
+	"os"
+	"syscall"
+)
+
+// A Conn represents a raw connection.
+type Conn struct {
+	network string
+	c       syscall.RawConn
+}
+
+// tcpConn is an interface implemented by net.TCPConn.
+// It can be used for interface assertions to check if a net.Conn is a TCP connection.
+type tcpConn interface {
+	SyscallConn() (syscall.RawConn, error)
+	SetLinger(int) error
+}
+
+var _ tcpConn = (*net.TCPConn)(nil)
+
+// udpConn is an interface implemented by net.UDPConn.
+// It can be used for interface assertions to check if a net.Conn is a UDP connection.
+type udpConn interface {
+	SyscallConn() (syscall.RawConn, error)
+	ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error)
+}
+
+var _ udpConn = (*net.UDPConn)(nil)
+
+// ipConn is an interface implemented by net.IPConn.
+// It can be used for interface assertions to check if a net.Conn is an IP connection.
+type ipConn interface {
+	SyscallConn() (syscall.RawConn, error)
+	ReadMsgIP(b, oob []byte) (n, oobn, flags int, addr *net.IPAddr, err error)
+}
+
+var _ ipConn = (*net.IPConn)(nil)
+
+// NewConn returns a new raw connection.
+func NewConn(c net.Conn) (*Conn, error) {
+	var err error
+	var cc Conn
+	switch c := c.(type) {
+	case tcpConn:
+		cc.network = "tcp"
+		cc.c, err = c.SyscallConn()
+	case udpConn:
+		cc.network = "udp"
+		cc.c, err = c.SyscallConn()
+	case ipConn:
+		cc.network = "ip"
+		cc.c, err = c.SyscallConn()
+	default:
+		return nil, errors.New("unknown connection type")
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &cc, nil
+}
+
+func (o *Option) get(c *Conn, b []byte) (int, error) {
+	var operr error
+	var n int
+	fn := func(s uintptr) {
+		n, operr = getsockopt(s, o.Level, o.Name, b)
+	}
+	if err := c.c.Control(fn); err != nil {
+		return 0, err
+	}
+	return n, os.NewSyscallError("getsockopt", operr)
+}
+
+func (o *Option) set(c *Conn, b []byte) error {
+	var operr error
+	fn := func(s uintptr) {
+		operr = setsockopt(s, o.Level, o.Name, b)
+	}
+	if err := c.c.Control(fn); err != nil {
+		return err
+	}
+	return os.NewSyscallError("setsockopt", operr)
+}

vendor/golang.org/x/net/internal/socket/rawconn_mmsg.go

@@ -0,0 +1,53 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux
+
+package socket
+
+import (
+	"net"
+)
+
+func (c *Conn) recvMsgs(ms []Message, flags int) (int, error) {
+	for i := range ms {
+		ms[i].raceWrite()
+	}
+	tmps := defaultMmsgTmpsPool.Get()
+	defer defaultMmsgTmpsPool.Put(tmps)
+	var parseFn func([]byte, string) (net.Addr, error)
+	if c.network != "tcp" {
+		parseFn = parseInetAddr
+	}
+	hs := tmps.packer.pack(ms, parseFn, nil)
+	n, err := tmps.syscaller.recvmmsg(c.c, hs, flags)
+	if err != nil {
+		return n, err
+	}
+	if err := hs[:n].unpack(ms[:n], parseFn, c.network); err != nil {
+		return n, err
+	}
+	return n, nil
+}
+
+func (c *Conn) sendMsgs(ms []Message, flags int) (int, error) {
+	for i := range ms {
+		ms[i].raceRead()
+	}
+	tmps := defaultMmsgTmpsPool.Get()
+	defer defaultMmsgTmpsPool.Put(tmps)
+	var marshalFn func(net.Addr, []byte) int
+	if c.network != "tcp" {
+		marshalFn = marshalInetAddr
+	}
+	hs := tmps.packer.pack(ms, nil, marshalFn)
+	n, err := tmps.syscaller.sendmmsg(c.c, hs, flags)
+	if err != nil {
+		return n, err
+	}
+	if err := hs[:n].unpack(ms[:n], nil, ""); err != nil {
+		return n, err
+	}
+	return n, nil
+}

vendor/golang.org/x/net/internal/socket/rawconn_msg.go

@@ -0,0 +1,59 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows || zos
+
+package socket
+
+import (
+	"net"
+	"os"
+)
+
+func (c *Conn) recvMsg(m *Message, flags int) error {
+	m.raceWrite()
+	var (
+		operr     error
+		n         int
+		oobn      int
+		recvflags int
+		from      net.Addr
+	)
+	fn := func(s uintptr) bool {
+		n, oobn, recvflags, from, operr = recvmsg(s, m.Buffers, m.OOB, flags, c.network)
+		return ioComplete(flags, operr)
+	}
+	if err := c.c.Read(fn); err != nil {
+		return err
+	}
+	if operr != nil {
+		return os.NewSyscallError("recvmsg", operr)
+	}
+	m.Addr = from
+	m.N = n
+	m.NN = oobn
+	m.Flags = recvflags
+	return nil
+}
+
+func (c *Conn) sendMsg(m *Message, flags int) error {
+	m.raceRead()
+	var (
+		operr error
+		n     int
+	)
+	fn := func(s uintptr) bool {
+		n, operr = sendmsg(s, m.Buffers, m.OOB, m.Addr, flags)
+		return ioComplete(flags, operr)
+	}
+	if err := c.c.Write(fn); err != nil {
+		return err
+	}
+	if operr != nil {
+		return os.NewSyscallError("sendmsg", operr)
+	}
+	m.N = n
+	m.NN = len(m.OOB)
+	return nil
+}

vendor/golang.org/x/net/internal/socket/rawconn_nommsg.go

@@ -0,0 +1,15 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !linux
+
+package socket
+
+func (c *Conn) recvMsgs(ms []Message, flags int) (int, error) {
+	return 0, errNotImplemented
+}
+
+func (c *Conn) sendMsgs(ms []Message, flags int) (int, error) {
+	return 0, errNotImplemented
+}

vendor/golang.org/x/net/internal/socket/rawconn_nomsg.go

@@ -0,0 +1,15 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+
+package socket
+
+func (c *Conn) recvMsg(m *Message, flags int) error {
+	return errNotImplemented
+}
+
+func (c *Conn) sendMsg(m *Message, flags int) error {
+	return errNotImplemented
+}

vendor/golang.org/x/net/internal/socket/socket.go

@@ -0,0 +1,280 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package socket provides a portable interface for socket system
+// calls.
+package socket // import "golang.org/x/net/internal/socket"
+
+import (
+	"errors"
+	"net"
+	"runtime"
+	"unsafe"
+)
+
+var errNotImplemented = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH)
+
+// An Option represents a sticky socket option.
+type Option struct {
+	Level int // level
+	Name  int // name; must be equal or greater than 1
+	Len   int // length of value in bytes; must be equal or greater than 1
+}
+
+// Get reads a value for the option from the kernel.
+// It returns the number of bytes written into b.
+func (o *Option) Get(c *Conn, b []byte) (int, error) {
+	if o.Name < 1 || o.Len < 1 {
+		return 0, errors.New("invalid option")
+	}
+	if len(b) < o.Len {
+		return 0, errors.New("short buffer")
+	}
+	return o.get(c, b)
+}
+
+// GetInt returns an integer value for the option.
+//
+// The Len field of Option must be either 1 or 4.
+func (o *Option) GetInt(c *Conn) (int, error) {
+	if o.Len != 1 && o.Len != 4 {
+		return 0, errors.New("invalid option")
+	}
+	var b []byte
+	var bb [4]byte
+	if o.Len == 1 {
+		b = bb[:1]
+	} else {
+		b = bb[:4]
+	}
+	n, err := o.get(c, b)
+	if err != nil {
+		return 0, err
+	}
+	if n != o.Len {
+		return 0, errors.New("invalid option length")
+	}
+	if o.Len == 1 {
+		return int(b[0]), nil
+	}
+	return int(NativeEndian.Uint32(b[:4])), nil
+}
+
+// Set writes the option and value to the kernel.
+func (o *Option) Set(c *Conn, b []byte) error {
+	if o.Name < 1 || o.Len < 1 {
+		return errors.New("invalid option")
+	}
+	if len(b) < o.Len {
+		return errors.New("short buffer")
+	}
+	return o.set(c, b)
+}
+
+// SetInt writes the option and value to the kernel.
+//
+// The Len field of Option must be either 1 or 4.
+func (o *Option) SetInt(c *Conn, v int) error {
+	if o.Len != 1 && o.Len != 4 {
+		return errors.New("invalid option")
+	}
+	var b []byte
+	if o.Len == 1 {
+		b = []byte{byte(v)}
+	} else {
+		var bb [4]byte
+		NativeEndian.PutUint32(bb[:o.Len], uint32(v))
+		b = bb[:4]
+	}
+	return o.set(c, b)
+}
+
+// ControlMessageSpace returns the whole length of control message.
+func ControlMessageSpace(dataLen int) int {
+	return controlMessageSpace(dataLen)
+}
+
+// A ControlMessage represents the head message in a stream of control
+// messages.
+//
+// A control message comprises of a header, data and a few padding
+// fields to conform to the interface to the kernel.
+//
+// See RFC 3542 for further information.
+type ControlMessage []byte
+
+// Data returns the data field of the control message at the head on
+// m.
+func (m ControlMessage) Data(dataLen int) []byte {
+	l := controlHeaderLen()
+	if len(m) < l || len(m) < l+dataLen {
+		return nil
+	}
+	return m[l : l+dataLen]
+}
+
+// Next returns the control message at the next on m.
+//
+// Next works only for standard control messages.
+func (m ControlMessage) Next(dataLen int) ControlMessage {
+	l := ControlMessageSpace(dataLen)
+	if len(m) < l {
+		return nil
+	}
+	return m[l:]
+}
+
+// MarshalHeader marshals the header fields of the control message at
+// the head on m.
+func (m ControlMessage) MarshalHeader(lvl, typ, dataLen int) error {
+	if len(m) < controlHeaderLen() {
+		return errors.New("short message")
+	}
+	h := (*cmsghdr)(unsafe.Pointer(&m[0]))
+	h.set(controlMessageLen(dataLen), lvl, typ)
+	return nil
+}
+
+// ParseHeader parses and returns the header fields of the control
+// message at the head on m.
+func (m ControlMessage) ParseHeader() (lvl, typ, dataLen int, err error) {
+	l := controlHeaderLen()
+	if len(m) < l {
+		return 0, 0, 0, errors.New("short message")
+	}
+	h := (*cmsghdr)(unsafe.Pointer(&m[0]))
+	return h.lvl(), h.typ(), int(uint64(h.len()) - uint64(l)), nil
+}
+
+// Marshal marshals the control message at the head on m, and returns
+// the next control message.
+func (m ControlMessage) Marshal(lvl, typ int, data []byte) (ControlMessage, error) {
+	l := len(data)
+	if len(m) < ControlMessageSpace(l) {
+		return nil, errors.New("short message")
+	}
+	h := (*cmsghdr)(unsafe.Pointer(&m[0]))
+	h.set(controlMessageLen(l), lvl, typ)
+	if l > 0 {
+		copy(m.Data(l), data)
+	}
+	return m.Next(l), nil
+}
+
+// Parse parses m as a single or multiple control messages.
+//
+// Parse works for both standard and compatible messages.
+func (m ControlMessage) Parse() ([]ControlMessage, error) {
+	var ms []ControlMessage
+	for len(m) >= controlHeaderLen() {
+		h := (*cmsghdr)(unsafe.Pointer(&m[0]))
+		l := h.len()
+		if l <= 0 {
+			return nil, errors.New("invalid header length")
+		}
+		if uint64(l) < uint64(controlHeaderLen()) {
+			return nil, errors.New("invalid message length")
+		}
+		if uint64(l) > uint64(len(m)) {
+			return nil, errors.New("short buffer")
+		}
+		// On message reception:
+		//
+		// |<- ControlMessageSpace --------------->|
+		// |<- controlMessageLen ---------->|      |
+		// |<- controlHeaderLen ->|         |      |
+		// +---------------+------+---------+------+
+		// |    Header     | PadH |  Data   | PadD |
+		// +---------------+------+---------+------+
+		//
+		// On compatible message reception:
+		//
+		// | ... |<- controlMessageLen ----------->|
+		// | ... |<- controlHeaderLen ->|          |
+		// +-----+---------------+------+----------+
+		// | ... |    Header     | PadH |   Data   |
+		// +-----+---------------+------+----------+
+		ms = append(ms, ControlMessage(m[:l]))
+		ll := l - controlHeaderLen()
+		if len(m) >= ControlMessageSpace(ll) {
+			m = m[ControlMessageSpace(ll):]
+		} else {
+			m = m[controlMessageLen(ll):]
+		}
+	}
+	return ms, nil
+}
+
+// NewControlMessage returns a new stream of control messages.
+func NewControlMessage(dataLen []int) ControlMessage {
+	var l int
+	for i := range dataLen {
+		l += ControlMessageSpace(dataLen[i])
+	}
+	return make([]byte, l)
+}
+
+// A Message represents an IO message.
+type Message struct {
+	// When writing, the Buffers field must contain at least one
+	// byte to write.
+	// When reading, the Buffers field will always contain a byte
+	// to read.
+	Buffers [][]byte
+
+	// OOB contains protocol-specific control or miscellaneous
+	// ancillary data known as out-of-band data.
+	OOB []byte
+
+	// Addr specifies a destination address when writing.
+	// It can be nil when the underlying protocol of the raw
+	// connection uses connection-oriented communication.
+	// After a successful read, it may contain the source address
+	// on the received packet.
+	Addr net.Addr
+
+	N     int // # of bytes read or written from/to Buffers
+	NN    int // # of bytes read or written from/to OOB
+	Flags int // protocol-specific information on the received message
+}
+
+// RecvMsg wraps recvmsg system call.
+//
+// The provided flags is a set of platform-dependent flags, such as
+// syscall.MSG_PEEK.
+func (c *Conn) RecvMsg(m *Message, flags int) error {
+	return c.recvMsg(m, flags)
+}
+
+// SendMsg wraps sendmsg system call.
+//
+// The provided flags is a set of platform-dependent flags, such as
+// syscall.MSG_DONTROUTE.
+func (c *Conn) SendMsg(m *Message, flags int) error {
+	return c.sendMsg(m, flags)
+}
+
+// RecvMsgs wraps recvmmsg system call.
+//
+// It returns the number of processed messages.
+//
+// The provided flags is a set of platform-dependent flags, such as
+// syscall.MSG_PEEK.
+//
+// Only Linux supports this.
+func (c *Conn) RecvMsgs(ms []Message, flags int) (int, error) {
+	return c.recvMsgs(ms, flags)
+}
+
+// SendMsgs wraps sendmmsg system call.
+//
+// It returns the number of processed messages.
+//
+// The provided flags is a set of platform-dependent flags, such as
+// syscall.MSG_DONTROUTE.
+//
+// Only Linux supports this.
+func (c *Conn) SendMsgs(ms []Message, flags int) (int, error) {
+	return c.sendMsgs(ms, flags)
+}

vendor/golang.org/x/net/internal/socket/sys.go

@@ -0,0 +1,23 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+import (
+	"encoding/binary"
+	"unsafe"
+)
+
+// NativeEndian is the machine native endian implementation of ByteOrder.
+var NativeEndian binary.ByteOrder
+
+func init() {
+	i := uint32(1)
+	b := (*[4]byte)(unsafe.Pointer(&i))
+	if b[0] == 1 {
+		NativeEndian = binary.LittleEndian
+	} else {
+		NativeEndian = binary.BigEndian
+	}
+}

vendor/golang.org/x/net/internal/socket/sys_bsd.go

@@ -0,0 +1,15 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || openbsd || solaris
+
+package socket
+
+func recvmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) {
+	return 0, errNotImplemented
+}
+
+func sendmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) {
+	return 0, errNotImplemented
+}

vendor/golang.org/x/net/internal/socket/sys_const_unix.go

@@ -0,0 +1,20 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+
+package socket
+
+import "golang.org/x/sys/unix"
+
+const (
+	sysAF_UNSPEC = unix.AF_UNSPEC
+	sysAF_INET   = unix.AF_INET
+	sysAF_INET6  = unix.AF_INET6
+
+	sysSOCK_RAW = unix.SOCK_RAW
+
+	sizeofSockaddrInet4 = unix.SizeofSockaddrInet4
+	sizeofSockaddrInet6 = unix.SizeofSockaddrInet6
+)

vendor/golang.org/x/net/internal/socket/sys_linux.go

@@ -0,0 +1,22 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && !s390x && !386
+
+package socket
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func recvmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) {
+	n, _, errno := syscall.Syscall6(sysRECVMMSG, s, uintptr(unsafe.Pointer(&hs[0])), uintptr(len(hs)), uintptr(flags), 0, 0)
+	return int(n), errnoErr(errno)
+}
+
+func sendmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) {
+	n, _, errno := syscall.Syscall6(sysSENDMMSG, s, uintptr(unsafe.Pointer(&hs[0])), uintptr(len(hs)), uintptr(flags), 0, 0)
+	return int(n), errnoErr(errno)
+}

vendor/golang.org/x/net/internal/socket/sys_linux_386.go

@@ -0,0 +1,28 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const (
+	sysRECVMMSG = 0x13
+	sysSENDMMSG = 0x14
+)
+
+func socketcall(call, a0, a1, a2, a3, a4, a5 uintptr) (uintptr, syscall.Errno)
+func rawsocketcall(call, a0, a1, a2, a3, a4, a5 uintptr) (uintptr, syscall.Errno)
+
+func recvmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) {
+	n, errno := socketcall(sysRECVMMSG, s, uintptr(unsafe.Pointer(&hs[0])), uintptr(len(hs)), uintptr(flags), 0, 0)
+	return int(n), errnoErr(errno)
+}
+
+func sendmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) {
+	n, errno := socketcall(sysSENDMMSG, s, uintptr(unsafe.Pointer(&hs[0])), uintptr(len(hs)), uintptr(flags), 0, 0)
+	return int(n), errnoErr(errno)
+}

vendor/golang.org/x/net/internal/socket/sys_linux_386.s

@@ -0,0 +1,11 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+TEXT	·socketcall(SB),NOSPLIT,$0-36
+	JMP	syscall·socketcall(SB)
+
+TEXT	·rawsocketcall(SB),NOSPLIT,$0-36
+	JMP	syscall·rawsocketcall(SB)

vendor/golang.org/x/net/internal/socket/sys_linux_amd64.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x12b
+	sysSENDMMSG = 0x133
+)

vendor/golang.org/x/net/internal/socket/sys_linux_arm.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x16d
+	sysSENDMMSG = 0x176
+)

vendor/golang.org/x/net/internal/socket/sys_linux_arm64.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0xf3
+	sysSENDMMSG = 0x10d
+)

vendor/golang.org/x/net/internal/socket/sys_linux_loong64.go

@@ -0,0 +1,12 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build loong64
+
+package socket
+
+const (
+	sysRECVMMSG = 0xf3
+	sysSENDMMSG = 0x10d
+)

vendor/golang.org/x/net/internal/socket/sys_linux_mips.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x10ef
+	sysSENDMMSG = 0x10f7
+)

vendor/golang.org/x/net/internal/socket/sys_linux_mips64.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x14ae
+	sysSENDMMSG = 0x14b6
+)

vendor/golang.org/x/net/internal/socket/sys_linux_mips64le.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x14ae
+	sysSENDMMSG = 0x14b6
+)

vendor/golang.org/x/net/internal/socket/sys_linux_mipsle.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x10ef
+	sysSENDMMSG = 0x10f7
+)

vendor/golang.org/x/net/internal/socket/sys_linux_ppc.go

@@ -0,0 +1,10 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x157
+	sysSENDMMSG = 0x15d
+)

vendor/golang.org/x/net/internal/socket/sys_linux_ppc64.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x157
+	sysSENDMMSG = 0x15d
+)

vendor/golang.org/x/net/internal/socket/sys_linux_ppc64le.go

@@ -0,0 +1,10 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+const (
+	sysRECVMMSG = 0x157
+	sysSENDMMSG = 0x15d
+)