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    Nat reflection and udp

    Scheduled Pinned Locked Moved NAT
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    • A
      aldo
      last edited by

      think i have it scott

      19000 stream udp nowait/0 nobody /usr/bin/nc nc -w 20 192.168.200.200 161

      this nc needs a -u option to get udp

      as per

      http://www.openbsd.org/cgi-bin/man.cgi?query=nc&sektion=1&manpath=OpenBSD+3.9

      the only other error that i saw was to do with this line which you seem to be working on. this line always shows up tcp not udp

      pass in quick on $lan inet proto tcp from any to $loopback port 19000 keep state label "NAT REFLECT: Allow traffic to localhost"

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      • A
        aldo
        last edited by

        line 919 fwrite($inetd_fd, "{$starting_localhost_port}\tstream\t{$protocol}\tnowait/0\tnobody\t/usr/bin/nc nc -w 20 {$target} {$loc_pt}\n");
        change this to
        fwrite($inetd_fd, "{$starting_localhost_port}\tstream\t{$protocol}\tnowait/0\tnobody\t/usr/bin/nc nc -w 20 -u {$target} {$loc_pt}\n");

        the problem with this seems to be that this line even though the case is udpsets both tcp and udp streams???? i am sure you might know what this means

        line 1891   $ipfrules .= "pass in quick on ${$ifname_real} inet proto tcp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
        change this to
        $ipfrules .= "pass in quick on ${$ifname_real} inet proto udp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";

        hope it helps  alan

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        • S
          sullrich
          last edited by

          Please issue these commands to test:

          fetch -o /etc/inc/ http://www.pfsense.com/~sullrich/filter.inc
          /etc/rc.filter_configure

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          • A
            aldo
            last edited by

            switch($rule['protocol']) {
                                                                                    case "tcp/udp":
                                                                                            $protocol = "{ tcp udp }";
                                                                                            $ipfrules .= "pass in quick on ${$ifname_real} inet proto tcp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                            $ipfrules .= "pass in quick on ${$ifname_real} inet proto udp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                            break;
                                                                                    case "tcp":
                                                                                    case "udp":
                                                                                            $protocol = $rule['protocol'];
                                                                                            $ipfrules .= "pass in quick on ${$ifname_real} inet proto udp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                            break;
                                                                                    default:
                                                                                            break;
                                                                            }

            **You need to add the case for tcp otherwise tcp get udp case set

            the stream looks good but the local host rule needs the tcp case filled in i tested this and it worked fine
                                                                                    case "tcp":
                                                                                            $protocol = $rule['protocol'];
                                                                                            $ipfrules .= "pass in quick on ${$ifname_real} inet proto tcp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                            break**;

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            • S
              sullrich
              last edited by

              There is no break, it automatically hits the next case.

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              • A
                aldo
                last edited by

                ok sorry i just stripped you code when pasting not mine

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                • A
                  aldo
                  last edited by

                  one last thing you have an extra white space on the udp stream now.
                  i did them both in clean cases before and all worked well

                  for the inetd i added info the the tcp case and the upd case as i did in the localhost allow rule your
                  solution was definatly neater but there is a whitespace issue

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                  • S
                    sullrich
                    last edited by

                    Please test the file that I posted.  It really should be working now.

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                    • S
                      sullrich
                      last edited by

                      @aldo:

                      one last thing you have an extra white space on the udp stream now.
                      i did them both in clean cases before and all worked well

                      for the inetd i added info the the tcp case and the upd case as i did in the localhost allow rule your
                      solution was definatly neater but there is a whitespace issue

                      Not sure what you mean.  Please show me either the generated rules from rules.debug or the netcat entries from inetd.conf

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                      • A
                        aldo
                        last edited by

                        19000 stream udp nowait/0 nobody /usr/bin/nc nc  -u -w 20 192.168.200.200 161
                        19002 stream tcp nowait/0 nobody /usr/bin/nc nc -w 20 192.168.200.200 8000

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                        • S
                          sullrich
                          last edited by

                          Yeah it doesn't look "good" but it should work..

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                          • A
                            aldo
                            last edited by

                            NAT Reflection rules

                            pass in quick on $lan inet proto udp from any to $loopback port 19000 keep state
                            label "NAT REFLECT: Allow traffic to localhost"
                            pass in quick on $lan inet proto udp from any to $loopback port 19001 keep state
                            label "NAT REFLECT: Allow traffic to localhost"

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                            • A
                              aldo
                              last edited by

                              /* $Id: filter.inc,v 1.575.2.248 2006/09/09 22:53:48 sullrich Exp $ */

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                              • A
                                aldo
                                last edited by

                                this definatly works correctly here

                                switch($rule['protocol']) {
                                                                                                        case "tcp/udp":
                                                                                                                $protocol = "{ tcp udp }";
                                                                                                                $ipfrules .= "pass in quick on ${$ifname_real} inet proto tcp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                                                $ipfrules .= "pass in quick on ${$ifname_real} inet proto udp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                                                break;
                                                                                                        case "tcp":
                                                                                                                $protocol = $rule['protocol'];
                                                                                                                $ipfrules .= "pass in quick on ${$ifname_real} inet proto tcp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                                                break;
                                                                                                        case "udp":
                                                                                                                $protocol = $rule['protocol'];
                                                                                                                $ipfrules .= "pass in quick on ${$ifname_real} inet proto udp from any to $loopback port {$starting_localhost_port} keep state label "NAT REFLECT: Allow traffic to localhost"\n";
                                                                                                                break;
                                                                                                        default:
                                                                                                                break;
                                                                                                }

                                NAT Reflection rules

                                pass in quick on $lan inet proto udp from any to $loopback port 19000 keep state
                                label "NAT REFLECT: Allow traffic to localhost"
                                pass in quick on $lan inet proto tcp from any to $loopback port 19001 keep state
                                label "NAT REFLECT: Allow traffic to localhost"

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                                • S
                                  sullrich
                                  last edited by

                                  Your not making any sense.  Are you saying what is commited does not work?  There is no difference, the udp case gets hit for tcp OR udp since there is no break.

                                  Watch this example program:

                                  $protocol = "tcp";

                                  switch($protocol) {
                                          case "tcp":
                                          case "udp":
                                                  echo "case met";

                                  }

                                  ?>

                                  php -f test.php

                                  case met#

                                  As you can see since there is no break, the case "udp" gets processed for either.

                                  Now consider this:

                                  $protocol = "udp";

                                  switch($protocol) {
                                          case "tcp":
                                          case "udp":
                                                  echo "case met";

                                  }

                                  ?>

                                  php -f test.php

                                  case met#

                                  As you can see you do not need to do it your way.

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                                  • A
                                    aldo
                                    last edited by

                                    i agree but that was the result

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                                    • S
                                      sullrich
                                      last edited by

                                      Rerun the commands that I mentioned earlier.  I have updated the file to cover the tcp case either way.

                                      I know for a fact that if other devs catch wind of this they are not going to like it.  I would have to agree with them, this should not be necessary.

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                                      • A
                                        aldo
                                        last edited by

                                        i see the issue scott

                                        make the udp case empty above the tcp case
                                        and fill in the tcp case but then look at your working cases in the rdr sections there is the issue
                                        i reran the commands but there is an error in the filter.inc on 389 or thereabouts now as well i fixed an if that was missing an I

                                        role it back scott i will work on it tomorrow i understand what youa re trying to achieve now and how you should do it using your method.
                                        i will have better resourses tomorrow i am at home at moment and is 1am

                                        i will send you the diffs tomorrow for your review

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                                        • A
                                          aldo
                                          last edited by

                                          ok i think you will be happy with the localhost rules but not so pleased with the nc inetd bits
                                          have a look and let me know

                                          it works perfectly and that was my goal

                                          filter.inc.txt

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                                          • S
                                            sullrich
                                            last edited by

                                            Looks like you started with a dated filter.inc.

                                            Can you:

                                            #1 update your filter.inc and make the changes again
                                            #2 send a diff -u patch?  I need to also make these changes in -HEAD which this will assist with

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