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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.

// IP-level socket options for Linux

package net

import (
        "os"
        "syscall"
)

func ipv4MulticastInterface(fd *netFD) (*Interface, error) {
        fd.incref()
        defer fd.decref()
        mreq, err := syscall.GetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF)
        if err != nil {
                return nil, os.NewSyscallError("getsockopt", err)
        }
        if int(mreq.Ifindex) == 0 {
                return nil, nil
        }
        return InterfaceByIndex(int(mreq.Ifindex))
}

func setIPv4MulticastInterface(fd *netFD, ifi *Interface) error {
        var v int32
        if ifi != nil {
                v = int32(ifi.Index)
        }
        mreq := &syscall.IPMreqn{Ifindex: v}
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptIPMreqn(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF, mreq)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv4MulticastTTL(fd *netFD) (int, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL)
        if err != nil {
                return -1, os.NewSyscallError("getsockopt", err)
        }
        return v, nil
}

func setIPv4MulticastTTL(fd *netFD, v int) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_TTL, v)
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv4MulticastLoopback(fd *netFD) (bool, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP)
        if err != nil {
                return false, os.NewSyscallError("getsockopt", err)
        }
        return v == 1, nil
}

func setIPv4MulticastLoopback(fd *netFD, v bool) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_LOOP, boolint(v))
        if err != nil {
                return os.NewSyscallError("setsockopt", err)
        }
        return nil
}

func ipv4ReceiveInterface(fd *netFD) (bool, error) {
        fd.incref()
        defer fd.decref()
        v, err := syscall.GetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_PKTINFO)
        if err != nil {
                return false, os.NewSyscallError("getsockopt", err)
        }
        return v == 1, nil
}

func setIPv4ReceiveInterface(fd *netFD, v bool) error {
        fd.incref()
        defer fd.decref()
        err := syscall.SetsockoptInt(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_PKTINFO, boolint(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
}