74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
// 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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// +build darwin dragonfly freebsd linux netbsd openbsd solaris
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package ipv4
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import (
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"unsafe"
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"golang.org/x/net/internal/iana"
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"golang.org/x/net/internal/socket"
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)
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func setControlMessage(c *socket.Conn, opt *rawOpt, cf ControlFlags, on bool) error {
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opt.Lock()
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defer opt.Unlock()
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if so, ok := sockOpts[ssoReceiveTTL]; ok && cf&FlagTTL != 0 {
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if err := so.SetInt(c, boolint(on)); err != nil {
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return err
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}
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if on {
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opt.set(FlagTTL)
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} else {
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opt.clear(FlagTTL)
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}
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}
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if so, ok := sockOpts[ssoPacketInfo]; ok {
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if cf&(FlagSrc|FlagDst|FlagInterface) != 0 {
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if err := so.SetInt(c, boolint(on)); err != nil {
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return err
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}
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if on {
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opt.set(cf & (FlagSrc | FlagDst | FlagInterface))
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} else {
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opt.clear(cf & (FlagSrc | FlagDst | FlagInterface))
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}
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}
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} else {
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if so, ok := sockOpts[ssoReceiveDst]; ok && cf&FlagDst != 0 {
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if err := so.SetInt(c, boolint(on)); err != nil {
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return err
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}
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if on {
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opt.set(FlagDst)
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} else {
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opt.clear(FlagDst)
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}
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}
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if so, ok := sockOpts[ssoReceiveInterface]; ok && cf&FlagInterface != 0 {
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if err := so.SetInt(c, boolint(on)); err != nil {
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return err
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}
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if on {
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opt.set(FlagInterface)
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} else {
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opt.clear(FlagInterface)
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}
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}
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}
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return nil
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}
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func marshalTTL(b []byte, cm *ControlMessage) []byte {
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m := socket.ControlMessage(b)
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m.MarshalHeader(iana.ProtocolIP, sysIP_RECVTTL, 1)
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return m.Next(1)
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}
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func parseTTL(cm *ControlMessage, b []byte) {
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cm.TTL = int(*(*byte)(unsafe.Pointer(&b[:1][0])))
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}
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