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
7package syscall
8
9import (
10	"unsafe"
11)
12
13// Deprecated: Use golang.org/x/net/bpf instead.
14func 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.
19func 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.
24func 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
44type iflags struct {
45	name  [IFNAMSIZ]byte
46	flags uint16
47}
48
49// Deprecated: Use golang.org/x/net/bpf instead.
50func SetLsfPromisc(name string, m bool) error {
51	s, e := Socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC, 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.
75func 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), unsafe.Sizeof(p))
80}
81
82// Deprecated: Use golang.org/x/net/bpf instead.
83func DetachLsf(fd int) error {
84	var dummy int
85	return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), unsafe.Sizeof(dummy))
86}
87