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#!/usr/bin/perl
##
## Copyright (c) 2010-2017 Intel Corporation
##
## Licensed under the Apache License, Version 2.0 (the "License");
## you may not use this file except in compliance with the License.
## You may obtain a copy of the License at
##
## http://www.apache.org/licenses/LICENSE-2.0
##
## Unless required by applicable law or agreed to in writing, software
## distributed under the License is distributed on an "AS IS" BASIS,
## WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
## See the License for the specific language governing permissions and
## limitations under the License.
##
use strict vars;
use Getopt::Long;
use Pod::Usage;
use Net::Pcap;
use Net::Frame::Layer;
use Net::Frame::Layer::ETH qw(:consts);
use Net::Frame::Layer::IPv6 qw(:consts);
use Net::Frame::Layer::IPv4 qw(:consts);
use Net::Frame::Layer::UDP;
use Socket qw(AF_INET AF_INET6 inet_ntop inet_pton);
use constant NUM_PACKETS => 30000;
use constant ETHER_ADDR_LEN => 6;
use constant ETHER_TYPE_LEN => 2;
use constant ETHER_HDR_LEN => ( 2 * ETHER_ADDR_LEN ) + ETHER_TYPE_LEN;
use constant ETHER_STATIC_MAC => "78acdddddddd";
use constant UDP_HDR_LEN => 8;
use constant UDP_STATIC_PORT => 0x6666;
use constant IPv6_HOP_LIMIT => 4;
use constant IPv6_STATIC_IP => "2222:2222:2222:2222:2222:2222:2222:2222";
use constant IPv4_TIME_TO_LIVE => 32;
use constant IPv4_STATIC_IP => "68.68.68.68";
srand;
my $type = 'tun';
my $pkt_count = NUM_PACKETS;
GetOptions(
'inet' => sub { $type = 'inet'},
'tun' => sub { $type = 'tun'},
'count=i' => \$pkt_count,
'in=s' => \(my $in = 'ip6_tun_bind.lua'),
'out=s' => \(my $out = 'output.pcap'),
'size=s' => \(my $size = 0)
) or exit;
my $pcap = pcap_open_dead( DLT_EN10MB, 65535 );
my $dumper = pcap_dump_open($pcap, $out ) or die 'Could not create output file: ' . $out;
if( $type eq 'inet' ) {
gen_inet_pcap( $in, $pkt_count );
}
if( $type eq 'tun' ) {
gen_tun_pcap( $in, $pkt_count );
}
pcap_close( $pcap );
# Trim string
sub trim {
my ( $str ) = @_;
$str =~ s/^\s+|\s+$//g;
return $str;
}
# Generate random port based on $port and $port_mask
sub rand_port {
my ( $port, $port_mask ) = @_;
return ( $port | int( rand( 0xFFFF ) & $port_mask ) );
}
# Generate packet originating from CPE
sub gen_tun_packet {
my ( $sz, $ether, $ipv6, $ipv4, $udp ) = @_;
my $hdr_ether = Net::Frame::Layer::ETH->new(
src => $ether->{'src'},
dst => $ether->{'dst'},
type => NF_ETH_TYPE_IPv6
)->pack;
my $hdr_ipv6 = Net::Frame::Layer::IPv6->new(
nextHeader => NF_IPv6_PROTOCOL_IPIP,
hopLimit => IPv6_HOP_LIMIT,
src => $ipv6->{'src'},
dst => $ipv6->{'dst'},
payloadLength => $sz + NF_IPv4_HDR_LEN + UDP_HDR_LEN
)->pack;
my $hdr_ipv4 = Net::Frame::Layer::IPv4->new(
length => $sz + UDP_HDR_LEN + NF_IPv4_HDR_LEN,
ttl => IPv4_TIME_TO_LIVE,
protocol => NF_IPv4_PROTOCOL_UDP,
src => $ipv4->{'src'},
dst => $ipv4->{'dst'}
)->pack;
my $hdr_udp = Net::Frame::Layer::UDP->new(
src => $udp->{'src'},
dst => $udp->{'dst'},
length => $sz + UDP_HDR_LEN
)->pack;
my $pkt = pack( "H*", "de" x $sz );
$pkt = $hdr_ether . $hdr_ipv6 . $hdr_ipv4 . $hdr_udp . $pkt;
my $pkt_size = length( $pkt );
my $hdr = {
tv_sec => 0,
tv_usec => 0,
len => $pkt_size,
caplen => $pkt_size
};
return ( $hdr, $pkt );
}
# Generate packet originating from the internet
sub gen_inet_packet {
my ( $sz, $ether, $ipv4, $udp ) = @_;
my $hdr_ether = Net::Frame::Layer::ETH->new(
src => $ether->{'src'},
dst => $ether->{'dst'},
type => NF_ETH_TYPE_IPv4
)->pack;
my $hdr_ipv4 = Net::Frame::Layer::IPv4->new(
length => $sz + UDP_HDR_LEN + NF_IPv4_HDR_LEN,
ttl => IPv4_TIME_TO_LIVE,
protocol => NF_IPv4_PROTOCOL_UDP,
src => $ipv4->{'src'},
dst => $ipv4->{'dst'}
)->pack;
my $hdr_udp = Net::Frame::Layer::UDP->new(
src => $udp->{'src'},
dst => $udp->{'dst'},
length => $sz + UDP_HDR_LEN
)->pack;
my $pkt = pack( "H*", "de" x $sz );
$pkt = $hdr_ether . $hdr_ipv4 . $hdr_udp . $pkt;
my $pkt_size = length( $pkt );
my $hdr = {
tv_sec => 0,
tv_usec => 0,
len => $pkt_size,
caplen => $pkt_size
};
return ( $hdr, $pkt );
}
# Read bindings file
sub read_bindings {
my ( $file ) = @_;
print "Reading bindings file...\n";
my @rows;
open my $fh, "<:encoding(utf8)", $file or die $file . ": $!";
LINE: while ( my $line = <$fh> ) {
next if ($line =~ /^--.*/); # Skip comments
my ($ip6, $mac, $ip4, $port);
if ($line =~ /\s*\{.*\},\s*$/) { # Weak check for a data line...
$line =~ /ip6\s*=\s*ip6\("([^\)]*)"\)/ && do { $ip6 = trim($1); };
unless ( inet_pton( AF_INET6, $ip6 ) ) { print "ERROR - Invalid ipv6: $ip6\n"; next LINE; }
$line =~ /ip\s*=\s*ip\("([^\)]*)"\)/ && do { $ip4 = trim($1); };
unless ( inet_pton( AF_INET, $ip4 ) ) { print "ERROR - Invalid ipv4: $ip4\n"; next LINE; }
$line =~ /mac\s*=\s*mac\("([^\)]*)"\)/ && do { $mac = trim($1); };
unless ( $mac =~ /^([0-9a-f]{2}([:-]|$)){6}$/i ) { print "ERROR - Invalid mac: $mac\n"; next LINE; }
$line =~ /port\s*=\s*([0-9]*)/ && do { $port = trim($1); };
unless ( int($port) ) { print "ERROR - Invalid port number: $port\n"; next LINE; }
push @rows, {
ipv6 => $ip6,
mac => $mac,
ipv4 => $ip4,
port => $port
}
}
}
close $fh;
return @rows;
}
# Generate packets originating from CPE
sub gen_tun_pcap {
my ( $binding_file, $pkt_count ) = @_;
my @bind = read_bindings($binding_file);
my $idx = 0;
my $row;
my $public_port = 0;
print "Generating $pkt_count Tunnel packets...\n";
my $max = @bind;
for( my $i=0; $i<$pkt_count; $i++ ) {
$idx = rand $max;
$row = @bind[$idx];
$public_port = rand_port( $row->{port}, 0x3f );
my ( $hdr, $pkt ) = gen_tun_packet(
$size,
{ src => $row->{mac}, dst => ETHER_STATIC_MAC },
{ src => $row->{ipv6}, dst => IPv6_STATIC_IP },
{ src => $row->{ipv4}, dst => IPv4_STATIC_IP },
{ src => $public_port, dst => UDP_STATIC_PORT }
);
pcap_dump( $dumper, $hdr, $pkt );
}
}
# Generate packets originating from the internet
sub gen_inet_pcap {
my ( $binding_file, $pkt_count ) = @_;
my @bind = read_bindings($binding_file);
my $idx = 0;
my $row;
my $public_port = 0;
print "Generating $pkt_count Internet packets...\n";
my $max = @bind;
for( my $i=0; $i<$pkt_count; $i++ ) {
$idx = rand $max;
$row = @bind[$idx];
$public_port = rand_port( $row->{port}, 0x3f );
my ( $hdr, $pkt ) = gen_inet_packet(
$size,
{ src => ETHER_STATIC_MAC, dst => $row->{mac} },
{ src => IPv4_STATIC_IP, dst => $row->{ipv4} },
{ src => UDP_STATIC_PORT, dst => $public_port }
);
pcap_dump( $dumper, $hdr, $pkt );
}
}
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