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// 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 ipv4
import (
"errors"
"net"
"runtime"
"golang.org/x/net/internal/socket"
)
var (
errInvalidConn = errors.New("invalid connection")
errMissingAddress = errors.New("missing address")
errMissingHeader = errors.New("missing header")
errNilHeader = errors.New("nil header")
errHeaderTooShort = errors.New("header too short")
errExtHeaderTooShort = errors.New("extension header too short")
errInvalidConnType = errors.New("invalid conn type")
errNoSuchInterface = errors.New("no such interface")
errNoSuchMulticastInterface = errors.New("no such multicast interface")
errNotImplemented = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH)
// See https://www.freebsd.org/doc/en/books/porters-handbook/versions.html.
freebsdVersion uint32
compatFreeBSD32 bool // 386 emulation on amd64
)
// See golang.org/issue/30899.
func adjustFreeBSD32(m *socket.Message) {
// FreeBSD 12.0-RELEASE is affected by https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236737
if 1200086 <= freebsdVersion && freebsdVersion < 1201000 {
l := (m.NN + 4 - 1) &^ (4 - 1)
if m.NN < l && l <= len(m.OOB) {
m.NN = l
}
}
}
func boolint(b bool) int {
if b {
return 1
}
return 0
}
func netAddrToIP4(a net.Addr) net.IP {
switch v := a.(type) {
case *net.UDPAddr:
if ip := v.IP.To4(); ip != nil {
return ip
}
case *net.IPAddr:
if ip := v.IP.To4(); ip != nil {
return ip
}
}
return nil
}
func opAddr(a net.Addr) net.Addr {
switch a.(type) {
case *net.TCPAddr:
if a == nil {
return nil
}
case *net.UDPAddr:
if a == nil {
return nil
}
case *net.IPAddr:
if a == nil {
return nil
}
}
return a
}
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