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// Copyright 2011 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.
// +build darwin dragonfly freebsd netbsd openbsd
// Berkeley packet filter for BSD variants
package syscall
import (
"unsafe"
)
func BpfStmt(code, k int) *BpfInsn {
return &BpfInsn{Code: uint16(code), K: uint32(k)}
}
func BpfJump(code, k, jt, jf int) *BpfInsn {
return &BpfInsn{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
}
func BpfBuflen(fd int) (int, error) {
var l int
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCGBLEN, uintptr(unsafe.Pointer(&l)))
if err != 0 {
return 0, Errno(err)
}
return l, nil
}
func SetBpfBuflen(fd, l int) (int, error) {
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCSBLEN, uintptr(unsafe.Pointer(&l)))
if err != 0 {
return 0, Errno(err)
}
return l, nil
}
func BpfDatalink(fd int) (int, error) {
var t int
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCGDLT, uintptr(unsafe.Pointer(&t)))
if err != 0 {
return 0, Errno(err)
}
return t, nil
}
func SetBpfDatalink(fd, t int) (int, error) {
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCSDLT, uintptr(unsafe.Pointer(&t)))
if err != 0 {
return 0, Errno(err)
}
return t, nil
}
func SetBpfPromisc(fd, m int) error {
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCPROMISC, uintptr(unsafe.Pointer(&m)))
if err != 0 {
return Errno(err)
}
return nil
}
func FlushBpf(fd int) error {
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCFLUSH, 0)
if err != 0 {
return Errno(err)
}
return nil
}
type ivalue struct {
name [IFNAMSIZ]byte
value int16
}
func BpfInterface(fd int, name string) (string, error) {
var iv ivalue
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCGETIF, uintptr(unsafe.Pointer(&iv)))
if err != 0 {
return "", Errno(err)
}
return name, nil
}
func SetBpfInterface(fd int, name string) error {
var iv ivalue
copy(iv.name[:], []byte(name))
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCSETIF, uintptr(unsafe.Pointer(&iv)))
if err != 0 {
return Errno(err)
}
return nil
}
func BpfTimeout(fd int) (*Timeval, error) {
var tv Timeval
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCGRTIMEOUT, uintptr(unsafe.Pointer(&tv)))
if err != 0 {
return nil, Errno(err)
}
return &tv, nil
}
func SetBpfTimeout(fd int, tv *Timeval) error {
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCSRTIMEOUT, uintptr(unsafe.Pointer(tv)))
if err != 0 {
return Errno(err)
}
return nil
}
func BpfStats(fd int) (*BpfStat, error) {
var s BpfStat
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCGSTATS, uintptr(unsafe.Pointer(&s)))
if err != 0 {
return nil, Errno(err)
}
return &s, nil
}
func SetBpfImmediate(fd, m int) error {
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCIMMEDIATE, uintptr(unsafe.Pointer(&m)))
if err != 0 {
return Errno(err)
}
return nil
}
func SetBpf(fd int, i []BpfInsn) error {
var p BpfProgram
p.Len = uint32(len(i))
p.Insns = (*BpfInsn)(unsafe.Pointer(&i[0]))
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCSETF, uintptr(unsafe.Pointer(&p)))
if err != 0 {
return Errno(err)
}
return nil
}
func CheckBpfVersion(fd int) error {
var v BpfVersion
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCVERSION, uintptr(unsafe.Pointer(&v)))
if err != 0 {
return Errno(err)
}
if v.Major != BPF_MAJOR_VERSION || v.Minor != BPF_MINOR_VERSION {
return EINVAL
}
return nil
}
func BpfHeadercmpl(fd int) (int, error) {
var f int
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCGHDRCMPLT, uintptr(unsafe.Pointer(&f)))
if err != 0 {
return 0, Errno(err)
}
return f, nil
}
func SetBpfHeadercmpl(fd, f int) error {
_, _, err := Syscall(SYS_IOCTL, uintptr(fd), BIOCSHDRCMPLT, uintptr(unsafe.Pointer(&f)))
if err != 0 {
return Errno(err)
}
return nil
}
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