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- // Copyright 2011 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
- // Linux socket filter
- package syscall
- import (
- "unsafe"
- )
- // Deprecated: Use golang.org/x/net/bpf instead.
- func LsfStmt(code, k int) *SockFilter {
- return &SockFilter{Code: uint16(code), K: uint32(k)}
- }
- // Deprecated: Use golang.org/x/net/bpf instead.
- func LsfJump(code, k, jt, jf int) *SockFilter {
- return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}
- }
- // Deprecated: Use golang.org/x/net/bpf instead.
- func LsfSocket(ifindex, proto int) (int, error) {
- var lsall SockaddrLinklayer
- // This is missing SOCK_CLOEXEC, but adding the flag
- // could break callers.
- s, e := Socket(AF_PACKET, SOCK_RAW, proto)
- if e != nil {
- return 0, e
- }
- p := (*[2]byte)(unsafe.Pointer(&lsall.Protocol))
- p[0] = byte(proto >> 8)
- p[1] = byte(proto)
- lsall.Ifindex = ifindex
- e = Bind(s, &lsall)
- if e != nil {
- Close(s)
- return 0, e
- }
- return s, nil
- }
- type iflags struct {
- name [IFNAMSIZ]byte
- flags uint16
- }
- // Deprecated: Use golang.org/x/net/bpf instead.
- func SetLsfPromisc(name string, m bool) error {
- s, e := cloexecSocket(AF_INET, SOCK_DGRAM, 0)
- if e != nil {
- return e
- }
- defer Close(s)
- var ifl iflags
- copy(ifl.name[:], []byte(name))
- _, _, ep := Syscall(SYS_IOCTL, uintptr(s), SIOCGIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
- if ep != 0 {
- return Errno(ep)
- }
- if m {
- ifl.flags |= uint16(IFF_PROMISC)
- } else {
- ifl.flags &^= uint16(IFF_PROMISC)
- }
- _, _, ep = Syscall(SYS_IOCTL, uintptr(s), SIOCSIFFLAGS, uintptr(unsafe.Pointer(&ifl)))
- if ep != 0 {
- return Errno(ep)
- }
- return nil
- }
- // Deprecated: Use golang.org/x/net/bpf instead.
- func AttachLsf(fd int, i []SockFilter) error {
- var p SockFprog
- p.Len = uint16(len(i))
- p.Filter = (*SockFilter)(unsafe.Pointer(&i[0]))
- return setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, unsafe.Pointer(&p), Socklen_t(unsafe.Sizeof(p)))
- }
- // Deprecated: Use golang.org/x/net/bpf instead.
- func DetachLsf(fd int) error {
- var dummy int
- return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, unsafe.Pointer(&dummy), Socklen_t(unsafe.Sizeof(dummy)))
- }
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