Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results

Home NTDEV
Before Posting...
Please check out the Community Guidelines in the Announcements and Administration Category.

More Info on Driver Writing and Debugging


The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.


Check out The OSR Learning Library at: https://www.osr.com/osr-learning-library/


Question on NET_BUFFER_LISTS and protocol.

IkkepopIkkepop Member Posts: 22
edited February 25 in NTDEV

As far as I can figure out NET_BUFFER will always give me the entire packet including the layer 2 headers (ethernet , wifi , etc ...). Is there some robust way to get where the IP header starts inside the NET_BUFFER and not rely on parsing the frames based on NDIS_MEDIUM (or maybe even that is not a feasible way)?
Also, can I make any assumptions about NET_BUFFERs that are within the same list or same chain of lists like, for example them being of the same protocol ?
I mean I know I can get NdisGetNetBufferListProtocolId and it will say that a list is all TCP, but it does not say weather it's all IPv4 or all IPv6, also does not say anything about the other lists in the chain.

Post edited by Ikkepop on

Comments

Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Kernel Debugging 30 Mar 2020 OSR Seminar Space
Developing Minifilters 15 Jun 2020 LIVE ONLINE
Writing WDF Drivers 22 June 2020 LIVE ONLINE
Internals & Software Drivers 28 Sept 2020 Dulles, VA