Question about modifing NDIS packet?

Hi everyone,

I am trying to modify the NDIS packet. Do i need to allocate new buffers?

I want to modify the destination IP address. I am doing the address mapping,
if i receive data for specific destination, i want to redirect that data to
go to another IP address. Do i need to allocate new buffers, copy all the
data from old packet, modify it and then send it again. Can i do the
following?

1. Query the NDIS packet.
2. Get the Virtual Address.
3. Modify the Header, with new IP and checksum.
4. Allocate new packet from my own pool.
5. Copy all the header information and OOB data.
6. Send that packet again.


Can i use the same buffer and packet. Or i will have to allocate new buffer
and packet if i am modifing the data in the packet.

Thanks in Advance

Rajesh

In news:(E-Mail Removed),
Rajesh Gupta <(E-Mail Removed)> posted their thoughts, then I offered mine
> Hi everyone,
>
> I am trying to modify the NDIS packet. Do i need to allocate new
> buffers?
>
> I want to modify the destination IP address. I am doing the address
> mapping, if i receive data for specific destination, i want to
> redirect that data to go to another IP address. Do i need to allocate
> new buffers, copy all the data from old packet, modify it and then
> send it again. Can i do the following?
>
> 1. Query the NDIS packet.
> 2. Get the Virtual Address.
> 3. Modify the Header, with new IP and checksum.
> 4. Allocate new packet from my own pool.
> 5. Copy all the header information and OOB data.
> 6. Send that packet again.
>
>
> Can i use the same buffer and packet. Or i will have to allocate new
> buffer and packet if i am modifing the data in the packet.
>
> Thanks in Advance
>
> Rajesh


Not sure, but see if this helps:

Q. Can I modify a NDIS packet that I did not allocate myself? A. No.
http://www.ndis.com/faq/QA01030301.htm

NDIS_PACKET Discussion - Part 1 - NDIS Packet Data
http://www.ndis.com/papers/ndispacket/ndispacket1.htm

Look here for more info:
http://www.google.com/search?hl=en&i...fy+ndis+packet

--
Regards,
Ace

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This posting is provided "AS-IS" with no warranties and confers no
rights.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory

HAM AND EGGS: A day's work for a chicken; A lifetime commitment for a
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