route/vendor/golang.org/x/net/ipv4/bpfopt_linux.go

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2017-03-26 19:50:20 +00:00
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ipv4
import (
"os"
"unsafe"
"golang.org/x/net/bpf"
"golang.org/x/net/internal/netreflect"
)
// SetBPF attaches a BPF program to the connection.
//
// Only supported on Linux.
func (c *dgramOpt) SetBPF(filter []bpf.RawInstruction) error {
s, err := netreflect.PacketSocketOf(c.PacketConn)
if err != nil {
return err
}
prog := sockFProg{
Len: uint16(len(filter)),
Filter: (*sockFilter)(unsafe.Pointer(&filter[0])),
}
return os.NewSyscallError("setsockopt", setsockopt(s, sysSOL_SOCKET, sysSO_ATTACH_FILTER, unsafe.Pointer(&prog), uint32(unsafe.Sizeof(prog))))
}