Subversion Repositories openrisc

// 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"

)

func LsfStmt(code, k int) *SockFilter {

        return &SockFilter{Code: uint16(code), K: uint32(k)}

}

func LsfJump(code, k, jt, jf int) *SockFilter {

        return &SockFilter{Code: uint16(code), Jt: uint8(jt), Jf: uint8(jf), K: uint32(k)}

}

func LsfSocket(ifindex, proto int) (int, error) {

        var lsall SockaddrLinklayer

        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

}

func SetLsfPromisc(name string, m bool) error {

        s, e := Socket(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

}

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, uintptr(unsafe.Pointer(&p)), unsafe.Sizeof(p))

}

func DetachLsf(fd int) error {

        var dummy int

        return setsockopt(fd, SOL_SOCKET, SO_DETACH_FILTER, uintptr(unsafe.Pointer(&dummy)), unsafe.Sizeof(dummy))

}