David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2016 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | // +build darwin dragonfly freebsd netbsd openbsd |
| 6 | |
| 7 | package nettest |
| 8 | |
| 9 | import ( |
| 10 | "runtime" |
| 11 | "strconv" |
| 12 | "strings" |
| 13 | "syscall" |
| 14 | ) |
| 15 | |
| 16 | var darwinVersion int |
| 17 | |
| 18 | func init() { |
| 19 | if runtime.GOOS == "darwin" { |
| 20 | // See http://support.apple.com/kb/HT1633. |
| 21 | s, err := syscall.Sysctl("kern.osrelease") |
| 22 | if err != nil { |
| 23 | return |
| 24 | } |
| 25 | ss := strings.Split(s, ".") |
| 26 | if len(ss) == 0 { |
| 27 | return |
| 28 | } |
| 29 | darwinVersion, _ = strconv.Atoi(ss[0]) |
| 30 | } |
| 31 | } |
| 32 | |
| 33 | func supportsIPv6MulticastDeliveryOnLoopback() bool { |
| 34 | switch runtime.GOOS { |
| 35 | case "freebsd": |
| 36 | // See http://www.freebsd.org/cgi/query-pr.cgi?pr=180065. |
| 37 | // Even after the fix, it looks like the latest |
| 38 | // kernels don't deliver link-local scoped multicast |
| 39 | // packets correctly. |
| 40 | return false |
| 41 | case "darwin": |
| 42 | return !causesIPv6Crash() |
| 43 | default: |
| 44 | return true |
| 45 | } |
| 46 | } |
| 47 | |
| 48 | func causesIPv6Crash() bool { |
| 49 | // We see some kernel crash when running IPv6 with IP-level |
| 50 | // options on Darwin kernel version 12 or below. |
| 51 | // See golang.org/issues/17015. |
| 52 | return darwinVersion < 13 |
| 53 | } |