mirror of
https://github.com/slackhq/nebula.git
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84 lines
1.6 KiB
Go
84 lines
1.6 KiB
Go
//go:build linux && (amd64 || arm64 || ppc64 || ppc64le || mips64 || mips64le || s390x || riscv64 || loong64) && !android && !e2e_testing
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// +build linux
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// +build amd64 arm64 ppc64 ppc64le mips64 mips64le s390x riscv64 loong64
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// +build !android
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// +build !e2e_testing
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package udp
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import (
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"golang.org/x/sys/unix"
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)
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type iovec struct {
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Base *byte
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Len uint64
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}
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type msghdr struct {
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Name *byte
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Namelen uint32
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Pad0 [4]byte
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Iov *iovec
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Iovlen uint64
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Control *byte
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Controllen uint64
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Flags int32
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Pad1 [4]byte
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}
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type rawMessage struct {
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Hdr msghdr
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Len uint32
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Pad0 [4]byte
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}
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func (u *StdConn) PrepareRawMessages(n, bufSize, cmsgSpace int) ([]rawMessage, [][]byte, [][]byte, []byte) {
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msgs := make([]rawMessage, n)
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buffers := make([][]byte, n)
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names := make([][]byte, n)
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var cmsgs []byte
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if cmsgSpace > 0 {
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cmsgs = make([]byte, n*cmsgSpace)
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}
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for i := range msgs {
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buffers[i] = make([]byte, bufSize)
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names[i] = make([]byte, unix.SizeofSockaddrInet6)
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vs := []iovec{
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{Base: &buffers[i][0], Len: uint64(len(buffers[i]))},
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}
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msgs[i].Hdr.Iov = &vs[0]
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msgs[i].Hdr.Iovlen = uint64(len(vs))
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msgs[i].Hdr.Name = &names[i][0]
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msgs[i].Hdr.Namelen = uint32(len(names[i]))
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if cmsgSpace > 0 {
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msgs[i].Hdr.Control = &cmsgs[i*cmsgSpace]
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msgs[i].Hdr.Controllen = uint64(cmsgSpace)
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}
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}
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return msgs, buffers, names, cmsgs
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}
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func setIovLen(v *iovec, n int) {
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v.Len = uint64(n)
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}
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func setMsgIovlen(m *msghdr, n int) {
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m.Iovlen = uint64(n)
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}
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func setMsgControllen(m *msghdr, n int) {
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m.Controllen = uint64(n)
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}
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func setCmsgLen(h *unix.Cmsghdr, n int) {
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h.Len = uint64(n)
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}
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