tcpdump mailing list archives
Re: proposal: rename DLT_PRISM_HEADER
From: "Guy Harris" <gharris () sonic net>
Date: Mon, 18 Nov 2002 23:28:59 -0800 (PST)
David Young said:
On Mon, Nov 18, 2002 at 04:04:21PM -0500, Stuffed Crust wrote:http://www.shaftnet.org/~pizza/software/capturefrm.txt is the current spec as implemented in the linux-wlan-ng driver and the ethereal dissector. Have a look; it's considerably more sane and flexible than the old format, and it's not tied closely to any one hardware type.I will use the AVS capture format in NetBSD, but I have some questions and suggestions. May we call this DLT_IEEE802_11_RADIO? What are the units for the mactime? The hosttime? It would be nice if the units were standardized (nanoseconds, picoseconds) or if the header carried some units indication. Also, is it desirable to indicate which packet feature the mactime marks (PLCP header, 802.11 header, packet end)? Is the dot11AntennaList given in the 802.11 spec? Any idea how the version numbers be coordinated? Any particular reason for the super-generous, 32-bit fields? Dave -- David Young OJC Technologies dyoung () ojctech com Engineering from the Right Brain
I'm CCing "pizza () shaftnet org" as I don't know whether he's on tcpdump.org or not. (If he's not, please CC him on all the replies; assume he's not until he says he is.( I can't answer most of the question, but I believe the *intent* was to introduce a new DLT_ value for the new radio header - but, pending support in Linux for a new ARPHRD_ value, the old value was used, with the first-word hack. We could *add* a *new* DLT_ value with the name you suggest, and have the old value interpreted either as having the old Prism header or the new TLV header depending on the first word, and interpret the new DLT_ value as having the TLV header, with NetBSD (and, presumably, eventually the other BSDs) using the new DLT_ value and with Linux using the new ARPHRD_ value (mapped to the new DLT_ value) if, as, and when they add the new ARPHRD_ value. - This is the TCPDUMP workers list. It is archived at http://www.tcpdump.org/lists/workers/index.html To unsubscribe use mailto:tcpdump-workers-request () tcpdump org?body=unsubscribe
Current thread:
- proposal: rename DLT_PRISM_HEADER David Young (Nov 18)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Nov 18)
- Message not available
- Re: proposal: rename DLT_PRISM_HEADER David Young (Nov 18)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Nov 19)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Dec 11)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Dec 11)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Dec 11)
- Message not available
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Nov 18)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Dec 16)
- Re: proposal: rename DLT_PRISM_HEADER Solomon Peachy (Dec 16)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Dec 16)
- Re: proposal: rename DLT_PRISM_HEADER David Young (Dec 16)
- Re: proposal: rename DLT_PRISM_HEADER Guy Harris (Dec 16)
- Re: proposal: rename DLT_PRISM_HEADER David Young (Dec 18)
- Re: proposal: rename DLT_PRISM_HEADER Solomon Peachy (Dec 18)