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// Copyright 2011 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.

// +build darwin freebsd netbsd openbsd

// IP-level socket options for BSD variants

package net

import (

        "os"

        "syscall"

)

func ipv4MulticastTTL(fd *netFD) (int, error) {

        fd.incref()

        defer fd.decref()

        v, err := syscall.GetsockoptByte(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL)

        if err != nil {

                return -1, os.NewSyscallError("getsockopt", err)

        }

        return int(v), nil

}

func setIPv4MulticastTTL(fd *netFD, v int) error {

        fd.incref()

        defer fd.decref()

        err := syscall.SetsockoptByte(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL, byte(v))

        if err != nil {

                return os.NewSyscallError("setsockopt", err)

        }

        return nil

}

func ipv6TrafficClass(fd *netFD) (int, error) {

        fd.incref()

        defer fd.decref()

        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_TCLASS)

        if err != nil {

                return -1, os.NewSyscallError("getsockopt", err)

        }

        return v, nil

}

func setIPv6TrafficClass(fd *netFD, v int) error {

        fd.incref()

        defer fd.decref()

        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IPV6, syscall.IPV6_TCLASS, v)

        if err != nil {

                return os.NewSyscallError("setsockopt", err)

        }

        return nil

}