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[lwip-users] [lwip] Date: Wed, 27 Feb 2002 16:44:34 +0500
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From: |
Muhammad Ashraf |
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Subject: |
[lwip-users] [lwip] Date: Wed, 27 Feb 2002 16:44:34 +0500 |
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Date: |
Thu, 09 Jan 2003 00:49:03 -0000 |
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i want to ask the purpose of the three variables define in the tcp_pcb =
structure.
snd_wl1
snd_wl2
snd_lbb
i know that snd_wl1 and snd_wl2 used for window updation but i am not =
able to understand that how these variables are used to=20
update the window.
In LwIP when tcp_new function is called it creates a new tcp_pcb =
structure type variable and put snd_wl2 to initial sequence number.
Now what about the snd_wl1.How it is set and used.Also in function =
tcp_receive what is purpose of this line of code
if(TCP_SEQ_LT(pcb->snd_wl1, seqno) ||(pcb->snd_wl1 =3D=3D seqno && =
TCP_SEQ_LT(pcb->snd_wl2, ackno)) || (pcb->snd_wl2 =3D=3D ackno && =
seg->tcphdr->wnd > pcb->snd_wnd)) {
Regards=20
ashraf
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META content=3D"MSHTML 5.00.2614.3500" name=3DGENERATOR>
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>i want to ask the purpose of the three =
variables=20
define in the tcp_pcb structure.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>snd_wl1</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>snd_wl2<BR>snd_lbb</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>i know that snd_wl1 and snd_wl2 used =
for window=20
updation but i am not able to understand that how these variables are =
used to=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>update the window.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>In LwIP when tcp_new function is called =
it creates=20
a new tcp_pcb structure type variable and put snd_wl2 to initial =
sequence=20
number.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Now what about the snd_wl1.How it is =
set and=20
used.Also in function tcp_receive what is purpose of this line of=20
code</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial =
size=3D2> if(TCP_SEQ_LT(pcb->snd_wl1, seqno)=20
||(pcb->snd_wl1 =3D=3D seqno && TCP_SEQ_LT(pcb->snd_wl2, =
ackno)) ||=20
(pcb->snd_wl2 =3D=3D ackno && seg->tcphdr->wnd >=20
pcb->snd_wnd)) {<BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Regards </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>ashraf</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> </DIV></FONT></BODY></HTML>
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