[lwip-devel] [bug #46685] pcb->accepts_pending is not decreased

[PIPON]

URL:
  <http://savannah.nongnu.org/bugs/?46685>

                 Summary: pcb->accepts_pending is not decreased
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: harvey
            Submitted on: mar. 15 déc. 2015 10:48:11 GMT
                Category: None
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.3.2

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Details:

Hello,

I'm new to this group.

Here is my problem .

I use a ftp server: to avoid multiple connection that causes a memory overflow
I activated *TCP_LISTEN_BACKLOG* with  TCP_DEFAULT_LISTEN_BACKLOG  6

I connect with winSCP to my ftp server on port 21 ( I'm not in passive mode )
The connection failed and retries are performed
For each retry pcb->accepts_pending is increased up to pcb->backlog
The problem is that it's never decreased : so when I want to make a correct
ftp connexion in passive mode , the connection fails.

At start
 
Active PCB states:
                Local port 23, foreign port 52064 snd_nxt 6934 rcv_nxt
1755408404 State: ESTABLISHED
Listen PCB states:
                Local port 21, foreign port 10 snd_nxt 0 rcv_nxt 3452816845
State: LISTEN
                Local port 23, foreign port 20 snd_nxt 0 rcv_nxt 3452816845
State: LISTEN


After retries:
 
Active PCB states:
                Local port 23, foreign port 52064 snd_nxt 7238 rcv_nxt
1755408410 State: ESTABLISHED
                Local port 21, foreign port 52115 snd_nxt 7824 rcv_nxt
3257071051 State: ESTABLISHED
                Local port 21, foreign port 52104 snd_nxt 7433 rcv_nxt
1725182136 State: CLOSE_WAIT
                Local port 21, foreign port 52088 snd_nxt 7149 rcv_nxt
4173042710 State: CLOSE_WAIT
                Local port 21, foreign port 52077 snd_nxt 6959 rcv_nxt
1606482214 State: CLOSE_WAIT
                Local port 21, foreign port 52069 snd_nxt 6881 rcv_nxt
2499358084 State: CLOSE_WAIT
Listen PCB states:
                Local port 21, foreign port 1290 snd_nxt 0 rcv_nxt 3452816845
State: LISTEN
                Local port 23, foreign port 20 snd_nxt 0 rcv_nxt 3452816845
State: LISTEN


After a while:
 
Active PCB states:
Local port 23, foreign port 52064 snd_nxt 7970 rcv_nxt 1755408416 State:
ESTABLISHED
Listen PCB states:
Local port 21, foreign port 1290 snd_nxt 0 rcv_nxt 3452816845 State: LISTEN
Local port 23, foreign port 20 snd_nxt 0 rcv_nxt 3452816845 State: LISTEN


pcb->accepts_pending  = 5 !!!!

I think it's not a correct behaviour...

Is there a solution ?

Regards




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