47 lines
990 B
Go
47 lines
990 B
Go
// Copyright 2016 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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//go:build darwin || dragonfly || freebsd || netbsd || openbsd
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// +build darwin dragonfly freebsd netbsd openbsd
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package route
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import (
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"syscall"
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"unsafe"
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)
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var (
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nativeEndian binaryByteOrder
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kernelAlign int
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rtmVersion byte
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wireFormats map[int]*wireFormat
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)
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func init() {
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i := uint32(1)
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b := (*[4]byte)(unsafe.Pointer(&i))
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if b[0] == 1 {
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nativeEndian = littleEndian
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} else {
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nativeEndian = bigEndian
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}
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// might get overridden in probeRoutingStack
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rtmVersion = syscall.RTM_VERSION
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kernelAlign, wireFormats = probeRoutingStack()
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}
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func roundup(l int) int {
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if l == 0 {
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return kernelAlign
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}
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return (l + kernelAlign - 1) &^ (kernelAlign - 1)
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}
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type wireFormat struct {
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extOff int // offset of header extension
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bodyOff int // offset of message body
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parse func(RIBType, []byte) (Message, error)
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}
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