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         // This is missing SOCK_CLOEXEC, but adding the flag
  27         // could break callers.
  28         s, e := Socket(AF_PACKET, SOCK_RAW, proto)
  29         if e != nil {
  30                 return 0, e
  31         }
  32         p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol))
  33         p[0] = byte(proto >> 8)
  34         p[1] = byte(proto)
  35         lsall.Ifindex = ifindex
  36         e = Bind(s, &lsall)
  37         if e != nil {
  38                 Close(s)
  39                 return 0, e
  40         }
  41         return s, nil
  42 }
  43
  44 type iflags struct {
  45         name  [IFNAMSIZ]byte
  46         flags uint16
  47 }
  48
  49 // Deprecated: Use golang.org/x/net/bpf instead.
  50 func SetLsfPromisc(name string, m bool) error {
  51         s, e := cloexecSocket(AF_INET, SOCK_DGRAM, 0)
  52         if e != nil {
  53                 return e
  54         }
  55         defer Close(s)
  56         var ifl iflags
  57         copy(ifl.name[:], []byte(name))
  58         _, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
  59         if ep != 0 {
  60                 return Errno(ep)
  61         }
  62         if m {
  63                 ifl.flags |= uint16(IFF_PROMISC)
  64         } else {
  65                 ifl.flags &^= uint16(IFF_PROMISC)
  66         }
  67         _, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
  68         if ep != 0 {
  69                 return Errno(ep)
  70         }
  71         return nil
  72 }
  73
  74 // Deprecated: Use golang.org/x/net/bpf instead.
  75 func AttachLsf(fd int, i []SockFilter) error {
  76         var p SockFprog
  77         p.Len = uint16(len(i))
  78         p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
  79         return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), Socklen_t(unsafe.Sizeof(p)))
  80 }
  81
  82 // Deprecated: Use golang.org/x/net/bpf instead.
  83 func DetachLsf(fd int) error {
  84         var dummy int
  85         return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), Socklen_t(unsafe.Sizeof(dummy)))
  86 }