mirror of
https://github.com/slackhq/nebula.git
synced 2025-11-22 08:24:25 +01:00
83 lines
1.7 KiB
Go
83 lines
1.7 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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"github.com/slackhq/nebula/packet"
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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 setRawMessageControl(msg *rawMessage, buf []byte) {
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if len(buf) == 0 {
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msg.Hdr.Control = nil
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msg.Hdr.Controllen = 0
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return
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}
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msg.Hdr.Control = &buf[0]
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msg.Hdr.Controllen = uint64(len(buf))
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}
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func getRawMessageControlLen(msg *rawMessage) int {
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return int(msg.Hdr.Controllen)
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}
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func setCmsgLen(h *unix.Cmsghdr, l int) {
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h.Len = uint64(l)
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}
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func (u *StdConn) PrepareRawMessages(n int, isV4 bool) ([]rawMessage, []*packet.Packet) {
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msgs := make([]rawMessage, n)
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packets := make([]*packet.Packet, n)
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for i := range msgs {
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packets[i] = packet.New(isV4)
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vs := []iovec{
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{Base: &packets[i].Payload[0], Len: uint64(packet.Size)},
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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 = &packets[i].Name[0]
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msgs[i].Hdr.Namelen = uint32(len(packets[i].Name))
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if u.enableGRO {
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msgs[i].Hdr.Control = &packets[i].Control[0]
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msgs[i].Hdr.Controllen = uint64(len(packets[i].Control))
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} else {
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msgs[i].Hdr.Control = nil
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msgs[i].Hdr.Controllen = 0
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}
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}
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return msgs, packets
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}
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