28 lines
750 B
Go
28 lines
750 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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package ipv4
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import (
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"os"
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"unsafe"
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"golang.org/x/net/bpf"
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"golang.org/x/net/internal/netreflect"
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)
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// SetBPF attaches a BPF program to the connection.
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//
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// Only supported on Linux.
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func (c *dgramOpt) SetBPF(filter []bpf.RawInstruction) error {
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s, err := netreflect.PacketSocketOf(c.PacketConn)
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if err != nil {
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return err
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}
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prog := sockFProg{
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Len: uint16(len(filter)),
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Filter: (*sockFilter)(unsafe.Pointer(&filter[0])),
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}
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return os.NewSyscallError("setsockopt", setsockopt(s, sysSOL_SOCKET, sysSO_ATTACH_FILTER, unsafe.Pointer(&prog), uint32(unsafe.Sizeof(prog))))
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}
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