libgo/go/syscall/lsf_linux.go

   1 // Copyright 2011 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // Linux socket filter
   6
   7 package syscall
   8
   9 import (
  10         "unsafe"
  11 )
  12
  13 // Deprecated: Use golang.org/x/net/bpf instead.
  14 func LsfStmt(code, k int) *SockFilter {
  15         return &SockFilter{Code: uint16(code), K: uint32(k)}
  16 }
  17
  18 // Deprecated: Use golang.org/x/net/bpf instead.
  19 func LsfJump(code, k, jt, jf int) *SockFilter {
  20         return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
  21 }
  22
  23 // Deprecated: Use golang.org/x/net/bpf instead.
  24 func LsfSocket(ifindex, proto int) (int, error) {
  25         var lsall SockaddrLinklayer
  26         s, e := Socket(AF_PACKET, SOCK_RAW, proto)
  27         if e != nil {
  28                 return 0, e
  29         }
  30         p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol))
  31         p[0] = byte(proto >> 8)
  32         p[1] = byte(proto)
  33         lsall.Ifindex = ifindex
  34         e = Bind(s, &lsall)
  35         if e != nil {
  36                 Close(s)
  37                 return 0, e
  38         }
  39         return s, nil
  40 }
  41
  42 type iflags struct {
  43         name  [IFNAMSIZ]byte
  44         flags uint16
  45 }
  46
  47 // Deprecated: Use golang.org/x/net/bpf instead.
  48 func SetLsfPromisc(name string, m bool) error {
  49         s, e := Socket(AF_INET, SOCK_DGRAM, 0)
  50         if e != nil {
  51                 return e
  52         }
  53         defer Close(s)
  54         var ifl iflags
  55         copy(ifl.name[:], []byte(name))
  56         _, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
  57         if ep != 0 {
  58                 return Errno(ep)
  59         }
  60         if m {
  61                 ifl.flags |= uint16(IFF_PROMISC)
  62         } else {
  63                 ifl.flags &^= uint16(IFF_PROMISC)
  64         }
  65         _, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
  66         if ep != 0 {
  67                 return Errno(ep)
  68         }
  69         return nil
  70 }
  71
  72 // Deprecated: Use golang.org/x/net/bpf instead.
  73 func AttachLsf(fd int, i []SockFilter) error {
  74         var p SockFprog
  75         p.Len = uint16(len(i))
  76         p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
  77         return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), Socklen_t(unsafe.Sizeof(p)))
  78 }
  79
  80 // Deprecated: Use golang.org/x/net/bpf instead.
  81 func DetachLsf(fd int) error {
  82         var dummy int
  83         return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), Socklen_t(unsafe.Sizeof(dummy)))
  84 }