Source file src/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), 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	

View as plain text