[Click] Expoting variables from other elements

[Pradeep Pradeep]

Hi all,
        Is there any way that an element in the click configuration can export variables/parameters of  other lements(in the configuration). If so, how can the FlowShaper element in the following configuration get the queue lengths of Queue elements OUT1 and OUT2? I am attaching the link to the paper in which authors (Eddie and Robert ) say that this export can be done.

       pdos.csail.mit.edu/~rtm/papers/click.pdf
       

require(iamanet);
AddressInfo (

10_1_3_3_mac    00:04:23:B7:1E:1E,//eth2-r1
        10_1_1_2_mac    00:04:23:B7:1E:1F,//eth3-r1
        10_1_1_3_mac    00:04:23:B7:1F:F6,//eth2-r2
        10_1_2_2_mac    00:04:23:B7:1F:F7,//eth3-r2




local_DOM1          10.1.3.254        10.1.3.0/24,   
local_DOM1_bcast    10.1.3.255,        
local_DOM1_default    10.1.3.0,

local_DOM2         10.1.1.1        10.1.1.0/24,    
local_DOM2_bcast    10.1.1.255,
local_DOM2_default    10.1.1.0,


local_DOM3         10.1.2.254        10.1.2.0/24,    
local_DOM3_bcast    10.1.2.255,
local_DOM3_default    10.1.2.0,




 source            10.1.3.0/24,    
 sink            10.1.2.0/24,

 source1        172.16.10.0/24,
 sink1            172.16.20.0/24,    

);

rt :: LinearIPLookup(

 sink        2,
 sink1        2,

 source        1,
 source1    1,

//source side
local_DOM1         0,   
local_DOM1_bcast   0,
local_DOM1_default 0,
local_DOM2        0,
local_DOM2_bcast    0,
local_DOM2_default    0,


255.255.255.255/32    0.0.0.0        0,
0.0.0.0/0        0,
0.0.0.0/32        0);
elementclass CheckTimeExceeded {
input-> ttl:: DecIPTTL
ttl[0]->output
ttl[1]-> ICMPError(local_DOM1, timeexceeded)->output

} 

ip :: Strip(14)
 -> CheckIPHeader(INTERFACES local_DOM1/24 local_DOM2/24 )
  -> IPC :: IPClassifier(src 10.1.3.0/24 and dst 10.1.2.0/24 and tcp,icmp, -);
      
                      
     IPC[0] ->fs1 :: FlowShaper(ok, MAX_SIZE 1455,MAX_RATE 2500)
            -> rt;
     IPC[1] -> rt;
     IPC[2] -> rt;
            

arpt :: Tee(3);

c0 :: Classifier(12/0806 20/0001, 12/0806 20/0002, 12/0800, -);
FromDevice(eth2) -> c0;
out0 :: Queue(200) 
-> todevice0 :: ToDevice(eth2);
c0[0] -> ar0 :: ARPResponder(local_DOM1 10_1_3_3_mac) -> out0;
arpq0 :: ARPQuerier(local_DOM1, 10_1_3_3_mac) -> out0;
c0[1] -> arpt;
arpt[0] -> [1]arpq0;
c0[2] -> Paint(1) -> ip;
c0[3] -> Discard;

// Input and output paths for ethernet interface 10_1_2_2 eth1
c1 :: Classifier(12/0806 20/0001, 12/0806 20/0002, 12/0800, -);
FromDevice(eth3) -> c1;
out1 :: Queue(200) 
-> todevice1 :: ToDevice(eth3);
c1[0] -> ar1 :: ARPResponder(local_DOM2 10_1_1_2_mac) -> out1;
arpq1 :: ARPQuerier(local_DOM2, 10_1_1_2_mac) -> out1;
c1[1]   -> arpt;
arpt[1] -> [1]arpq1;
c1[2]   -> Paint(2) -> ip;
c1[3]   -> Discard;

// Local delivery
arpt[2] -> Discard;
rt[0]   -> EtherEncap(0x0800, 1:1:1:1:1:1, 2:2:2:2:2:2) -> Discard;

rt[1] -> DropBroadcasts
      -> cp0 :: PaintTee(1)
      -> gio0 :: IPGWOptions(local_DOM1)
      -> FixIPSrc(local_DOM1)
      -> dt0 :: DecIPTTL
      -> fr0 :: IPFragmenter(1500)
      -> [0]arpq0;
dt0[1]  -> ICMPError(local_DOM1, timeexceeded) -> rt;
fr0[1]  -> ICMPError(local_DOM1, unreachable, needfrag) -> rt;
gio0[1] -> ICMPError(local_DOM1, parameterproblem) -> rt;
cp0[1]  -> ICMPError(local_DOM1, redirect, host) -> Discard;

rt[2] -> DropBroadcasts
      -> cp1 :: PaintTee(2)
      -> gio1 :: IPGWOptions(local_DOM2)
      -> FixIPSrc(local_DOM2)
      -> dt1 :: DecIPTTL
      -> fr1 :: IPFragmenter(1500)
      -> EtherEncap(0x0800, 10_1_1_2_mac, 10_1_1_3_mac)
      -> out1;
dt1[1]  -> ICMPError(local_DOM2, timeexceeded) -> rt;
fr1[1]  -> ICMPError(local_DOM2, unreachable, needfrag) -> rt;
gio1[1] -> ICMPError(local_DOM2, parameterproblem) -> rt;
cp1[1]  -> ICMPError(local_DOM2, redirect, host) -> Discard;

rt[3] -> DropBroadcasts
    -> cp6 :: PaintTee(1)
    -> gio6 :: IPGWOptions(local_DOM2)
    -> FixIPSrc(local_DOM2)
    -> dt6 :: DecIPTTL
//    -> IPPrint("To eth_DOM2")
    -> fr6 :: IPFragmenter(1500)
    -> [0]arpq1;
dt6[1] -> ICMPError(local_DOM2, timeexceeded) -> rt;
fr6[1] -> ICMPError(local_DOM2, unreachable, needfrag) -> rt;
gio6[1] -> ICMPError(local_DOM2, parameterproblem) -> rt;
cp6[1] -> ICMPError(local_DOM2, redirect, host) -> Discard;

Regards,
Pradeep.

  



 

       
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