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eeb64b7fef
As mentioned in http://gitweb.dragonflybsd.org/dragonfly.git/commit/727ccde8cce813911d885b7f6ed749dcea68a886, DragonFly BSD is dropping support for IPv6 IPv4-mapped address. Unfortunately, on some released versions we see the kernels pretend to support the feature but actually not (unless tweaking some kernel states via sysctl.) To avoid unpredictable behavior, the net package assumes that all DragonFly BSD kernels don't support IPv6 IPv4-mapped address. Fixes #10764. Change-Id: Ic7af3651e0372ec03774432fbb6b2eb0c455e994 Reviewed-on: https://go-review.googlesource.com/10071 Reviewed-by: Ian Lance Taylor <iant@golang.org>
55 lines
2.1 KiB
Go
55 lines
2.1 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build darwin dragonfly freebsd netbsd openbsd
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package net
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import (
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"os"
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"runtime"
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"syscall"
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)
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func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
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if runtime.GOOS == "dragonfly" && sotype != syscall.SOCK_RAW {
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// On DragonFly BSD, we adjust the ephemeral port
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// range because unlike other BSD systems its default
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// port range doesn't conform to IANA recommendation
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// as described in RFC 6056 and is pretty narrow.
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switch family {
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case syscall.AF_INET:
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syscall.SetsockoptInt(s, syscall.IPPROTO_IP, syscall.IP_PORTRANGE, syscall.IP_PORTRANGE_HIGH)
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case syscall.AF_INET6:
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syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_PORTRANGE, syscall.IPV6_PORTRANGE_HIGH)
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}
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}
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if supportsIPv4map && family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
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// Allow both IP versions even if the OS default
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// is otherwise. Note that some operating systems
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// never admit this option.
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syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
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}
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// Allow broadcast.
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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
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}
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func setDefaultListenerSockopts(s int) error {
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// Allow reuse of recently-used addresses.
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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
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}
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func setDefaultMulticastSockopts(s int) error {
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// Allow multicast UDP and raw IP datagram sockets to listen
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// concurrently across multiple listeners.
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if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
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return os.NewSyscallError("setsockopt", err)
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}
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// Allow reuse of recently-used ports.
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// This option is supported only in descendants of 4.4BSD,
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// to make an effective multicast application that requires
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// quick draw possible.
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return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1))
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}
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