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flowgen.pl
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flowgen.pl
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#! /usr/bin/perl
# Copyright (c) 2009, 2010 Nicira Networks.
#
# 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;
use warnings;
open(FLOWS, ">&=3");# or die "failed to open fd 3 for writing: $!\n";
open(PACKETS, ">&=4");# or die "failed to open fd 4 for writing: $!\n";
# Print pcap file header.
print PACKETS pack('NnnNNNN',
0xa1b2c3d4, # magic number
2, # major version
4, # minor version
0, # time zone offset
0, # time stamp accuracy
1518, # snaplen
1); # Ethernet
output(DL_HEADER => '802.2');
for my $dl_header qw(802.2+SNAP Ethernet) {
my %a = (DL_HEADER => $dl_header);
for my $dl_vlan qw(none zero nonzero) {
my %b = (%a, DL_VLAN => $dl_vlan);
# Non-IP case.
output(%b, DL_TYPE => 'non-ip');
for my $ip_options qw(no yes) {
my %c = (%b, DL_TYPE => 'ip', IP_OPTIONS => $ip_options);
for my $ip_fragment qw(no first middle last) {
my %d = (%c, IP_FRAGMENT => $ip_fragment);
for my $tp_proto qw(TCP TCP+options UDP ICMP other) {
output(%d, TP_PROTO => $tp_proto);
}
}
}
}
}
sub output {
my (%attrs) = @_;
# Compose flow.
my (%flow);
$flow{DL_SRC} = "00:02:e3:0f:80:a4";
$flow{DL_DST} = "00:1a:92:40:ac:05";
$flow{NW_PROTO} = 0;
$flow{NW_TOS} = 0;
$flow{NW_SRC} = '0.0.0.0';
$flow{NW_DST} = '0.0.0.0';
$flow{TP_SRC} = 0;
$flow{TP_DST} = 0;
if (defined($attrs{DL_VLAN})) {
my (%vlan_map) = ('none' => 0xffff,
'zero' => 0,
'nonzero' => 0x0123);
$flow{DL_VLAN} = $vlan_map{$attrs{DL_VLAN}};
} else {
$flow{DL_VLAN} = 0xffff; # OFP_VLAN_NONE
}
if ($attrs{DL_HEADER} eq '802.2') {
$flow{DL_TYPE} = 0x5ff; # OFP_DL_TYPE_NOT_ETH_TYPE
} elsif ($attrs{DL_TYPE} eq 'ip') {
$flow{DL_TYPE} = 0x0800; # ETH_TYPE_IP
$flow{NW_SRC} = '10.0.2.15';
$flow{NW_DST} = '192.168.1.20';
$flow{NW_TOS} = 44;
if ($attrs{TP_PROTO} eq 'other') {
$flow{NW_PROTO} = 42;
} elsif ($attrs{TP_PROTO} eq 'TCP' ||
$attrs{TP_PROTO} eq 'TCP+options') {
$flow{NW_PROTO} = 6; # IP_TYPE_TCP
$flow{TP_SRC} = 6667;
$flow{TP_DST} = 9998;
} elsif ($attrs{TP_PROTO} eq 'UDP') {
$flow{NW_PROTO} = 17; # IP_TYPE_UDP
$flow{TP_SRC} = 1112;
$flow{TP_DST} = 2223;
} elsif ($attrs{TP_PROTO} eq 'ICMP') {
$flow{NW_PROTO} = 1; # IP_TYPE_ICMP
$flow{TP_SRC} = 8; # echo request
$flow{TP_DST} = 0; # code
} else {
die;
}
if ($attrs{IP_FRAGMENT} ne 'no') {
$flow{TP_SRC} = $flow{TP_DST} = 0;
}
} elsif ($attrs{DL_TYPE} eq 'non-ip') {
$flow{DL_TYPE} = 0x5678;
} else {
die;
}
# Compose packet.
my $packet = '';
$packet .= pack_ethaddr($flow{DL_DST});
$packet .= pack_ethaddr($flow{DL_SRC});
$packet .= pack('n', 0) if $attrs{DL_HEADER} =~ /^802.2/;
if ($attrs{DL_HEADER} eq '802.2') {
$packet .= pack('CCC', 0x42, 0x42, 0x03); # LLC for 802.1D STP.
} else {
if ($attrs{DL_HEADER} eq '802.2+SNAP') {
$packet .= pack('CCC', 0xaa, 0xaa, 0x03); # LLC for SNAP.
$packet .= pack('CCC', 0, 0, 0); # SNAP OUI.
}
if ($attrs{DL_VLAN} ne 'none') {
$packet .= pack('nn', 0x8100, $flow{DL_VLAN});
}
$packet .= pack('n', $flow{DL_TYPE});
if ($attrs{DL_TYPE} eq 'ip') {
my $ip = pack('CCnnnCCnNN',
(4 << 4) | 5, # version, hdrlen
$flow{NW_TOS}, # type of service
0, # total length (filled in later)
65432, # id
0, # frag offset
64, # ttl
$flow{NW_PROTO}, # protocol
0, # checksum
0x0a00020f, # source
0xc0a80114); # dest
if ($attrs{IP_OPTIONS} eq 'yes') {
substr($ip, 0, 1) = pack('C', (4 << 4) | 8);
$ip .= pack('CCnnnCCCx',
130, # type
11, # length
0x6bc5, # top secret
0xabcd,
0x1234,
1,
2,
3);
}
if ($attrs{IP_FRAGMENT} ne 'no') {
my (%frag_map) = ('first' => 0x2000, # more frags, ofs 0
'middle' => 0x2111, # more frags, ofs 0x888
'last' => 0x0222); # last frag, ofs 0x1110
substr($ip, 6, 2)
= pack('n', $frag_map{$attrs{IP_FRAGMENT}});
}
if ($attrs{TP_PROTO} =~ '^TCP') {
my $tcp = pack('nnNNnnnn',
$flow{TP_SRC}, # source port
$flow{TP_DST}, # dest port
87123455, # seqno
712378912, # ackno
(5 << 12) | 0x02 | 0x10, # hdrlen, SYN, ACK
5823, # window size
18923, # checksum
12893); # urgent pointer
if ($attrs{TP_PROTO} eq 'TCP+options') {
substr($tcp, 12, 2) = pack('n', (6 << 12) | 0x02 | 0x10);
$tcp .= pack('CCn', 2, 4, 1975); # MSS option
}
$tcp .= 'payload';
$ip .= $tcp;
} elsif ($attrs{TP_PROTO} eq 'UDP') {
my $len = 15;
my $udp = pack('nnnn', $flow{TP_SRC}, $flow{TP_DST}, $len, 0);
$udp .= chr($len) while length($udp) < $len;
$ip .= $udp;
} elsif ($attrs{TP_PROTO} eq 'ICMP') {
$ip .= pack('CCnnn',
8, # echo request
0, # code
0, # checksum
736, # identifier
931); # sequence number
} elsif ($attrs{TP_PROTO} eq 'other') {
$ip .= 'other header';
} else {
die;
}
substr($ip, 2, 2) = pack('n', length($ip));
$packet .= $ip;
}
}
substr($packet, 12, 2) = pack('n', length($packet))
if $attrs{DL_HEADER} =~ /^802.2/;
print join(' ', map("$_=$attrs{$_}", keys(%attrs))), "\n";
print join(' ', map("$_=$flow{$_}", keys(%flow))), "\n";
print "\n";
print FLOWS pack('Nn',
0, # wildcards
1); # in_port
print FLOWS pack_ethaddr($flow{DL_SRC});
print FLOWS pack_ethaddr($flow{DL_DST});
print FLOWS pack('nCxnCCxxNNnn',
$flow{DL_VLAN},
0, # DL_VLAN_PCP
$flow{DL_TYPE},
$flow{NW_TOS},
$flow{NW_PROTO},
inet_aton($flow{NW_SRC}),
inet_aton($flow{NW_DST}),
$flow{TP_SRC},
$flow{TP_DST});
print PACKETS pack('NNNN',
0, # timestamp seconds
0, # timestamp microseconds
length($packet), # bytes saved
length($packet)), # total length
$packet;
}
sub pack_ethaddr {
local ($_) = @_;
my $xx = '([0-9a-fA-F][0-9a-fA-F])';
my (@octets) = /$xx:$xx:$xx:$xx:$xx:$xx/;
@octets == 6 or die $_;
my ($out) = '';
$out .= pack('C', hex($_)) foreach @octets;
return $out;
}
sub inet_aton {
local ($_) = @_;
my ($a, $b, $c, $d) = /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/;
defined $d or die $_;
return ($a << 24) | ($b << 16) | ($c << 8) | $d;
}