// Copyright 2012 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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package ipv4
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import (
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"errors"
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"net"
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"runtime"
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"golang.org/x/net/internal/socket"
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)
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var (
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errInvalidConn = errors.New("invalid connection")
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errMissingAddress = errors.New("missing address")
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errMissingHeader = errors.New("missing header")
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errNilHeader = errors.New("nil header")
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errHeaderTooShort = errors.New("header too short")
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errExtHeaderTooShort = errors.New("extension header too short")
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errInvalidConnType = errors.New("invalid conn type")
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errNoSuchInterface = errors.New("no such interface")
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errNoSuchMulticastInterface = errors.New("no such multicast interface")
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errNotImplemented = errors.New("not implemented on " + runtime.GOOS + "/" + runtime.GOARCH)
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// See https://www.freebsd.org/doc/en/books/porters-handbook/versions.html.
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freebsdVersion uint32
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compatFreeBSD32 bool // 386 emulation on amd64
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)
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// See golang.org/issue/30899.
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func adjustFreeBSD32(m *socket.Message) {
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// FreeBSD 12.0-RELEASE is affected by https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236737
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if 1200086 <= freebsdVersion && freebsdVersion < 1201000 {
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l := (m.NN + 4 - 1) &^ (4 - 1)
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if m.NN < l && l <= len(m.OOB) {
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m.NN = l
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}
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}
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}
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func boolint(b bool) int {
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if b {
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return 1
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}
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return 0
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}
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func netAddrToIP4(a net.Addr) net.IP {
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switch v := a.(type) {
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case *net.UDPAddr:
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if ip := v.IP.To4(); ip != nil {
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return ip
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}
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case *net.IPAddr:
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if ip := v.IP.To4(); ip != nil {
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return ip
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}
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}
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return nil
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}
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func opAddr(a net.Addr) net.Addr {
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switch a.(type) {
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case *net.TCPAddr:
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if a == nil {
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return nil
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}
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case *net.UDPAddr:
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if a == nil {
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return nil
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}
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case *net.IPAddr:
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if a == nil {
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return nil
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}
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}
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return a
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}
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