* TCP/IP stack
@ 2001-06-28 14:33 Michael J Clark
2001-06-28 20:06 ` Matti Aarnio
2001-06-29 15:32 ` Kevin Buhr
0 siblings, 2 replies; 3+ messages in thread
From: Michael J Clark @ 2001-06-28 14:33 UTC (permalink / raw)
To: linux-kernel
hey guys,
I have been reading through TCP/IP Illustrated Vol 2 and the linux
source. I am having a heck of a time finding where it sees a SYN packet
and check to see if the desitination port is open. In the book it looks
like it happens in tcp_input where it looks for the PCB for a segment.
Any pointers would be greatly appeciated.
Mike
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: TCP/IP stack
2001-06-28 14:33 TCP/IP stack Michael J Clark
@ 2001-06-28 20:06 ` Matti Aarnio
2001-06-29 15:32 ` Kevin Buhr
1 sibling, 0 replies; 3+ messages in thread
From: Matti Aarnio @ 2001-06-28 20:06 UTC (permalink / raw)
To: Michael J Clark; +Cc: linux-kernel, rgooch
Richard, should there be (is there?) linux-networking-faq, or can this
be put into the linux-kernel faq ?
On Thu, Jun 28, 2001 at 10:33:46AM -0400, Michael J Clark wrote:
> hey guys,
>
> I have been reading through TCP/IP Illustrated Vol 2 and the linux
> source.
That book describes BSD implementation.
Linux code has been written completely independently, and using
fundamentally different base structure -- instead of PCBs containing
chains of segments, Linux has SKBs with entire segment contiguous
in it.
Function, and structure names are different, naturally.
> Mike
/Matti Aarnio
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: TCP/IP stack
2001-06-28 14:33 TCP/IP stack Michael J Clark
2001-06-28 20:06 ` Matti Aarnio
@ 2001-06-29 15:32 ` Kevin Buhr
1 sibling, 0 replies; 3+ messages in thread
From: Kevin Buhr @ 2001-06-29 15:32 UTC (permalink / raw)
To: Michael J Clark; +Cc: linux-kernel
Michael J Clark <clarkmic@pobox.upenn.edu> writes:
>
> I have been reading through TCP/IP Illustrated Vol 2 and the linux
> source. I am having a heck of a time finding where it sees a SYN packet
> and check to see if the desitination port is open. In the book it looks
> like it happens in tcp_input where it looks for the PCB for a segment.
> Any pointers would be greatly appeciated.
In 2.2.19 (since I have the source handy), this processing is done in
"linux/net/ipv4/tcp_input.c" in function "tcp_rcv_state_process". If
a SYN packet arrives and the socket is in state TCP_LISTEN, the
address-family-specific "conn_request" function is called. For IPv4,
this is "tcp_v4_conn_request" in "tcp_ipv4.c".
On the other hand, if a SYN packet is sent to a TCP_CLOSE socket,
"tcp_rcv_state_process" returns 1. This is an indication to the
caller ("tcp_v4_do_rcv" in "tcp_ipv4.c", in the case of IPv4) to send
a RST packet.
Kevin <buhr@stat.wisc.edu>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2001-06-28 20:06 ` Matti Aarnio
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