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), 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), unsafe.Sizeof(dummy)) 84 } 85
