RadioTap Archive on lore.kernel.org
 help / color / Atom feed
From: Harald Welte <laforge-TgoAw6mPHtdg9hUCZPvPmw@public.gmane.org>
To: Guy Harris <guy-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
Cc: "Johannes Berg"
	<johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>,
	"Vadim Yanitskiy"
	<axilirator-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"OpenBSC Mailing List"
	<openbsc-qjLDD68F18N4m7O/Vxda39i2O/JbrIOy@public.gmane.org>,
	"Sean Tranchetti"
	<stranche-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	radiotap-S783fYmB3Ccdnm+yROfE0A@public.gmane.org,
	"Dan Williams" <dcbw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	netdev <netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Aleksander Morgado"
	<aleksander-Dvg4H30XQSRVIjRurl1/8g@public.gmane.org>,
	"Subash Abhinov Kasiviswanathan"
	<subashab-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	"Bjørn Mork" <bjorn-yOkvZcmFvRU@public.gmane.org>
Subject: Re: gsmtap design/extensions?
Date: Sat, 13 Apr 2019 08:41:52 +0200
Message-ID: <20190413064152.GB24451__16203.3970862225$1555138223$gmane$org@nataraja> (raw)
In-Reply-To: <1D6FE33B-DC15-47D8-A1AD-E95608300FDC-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>

Dear Guy and others,

On Fri, Apr 12, 2019 at 03:47:26PM -0700, Guy Harris wrote:
> On Apr 12, 2019, at 12:54 PM, Guy Harris <guy-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> wrote:
> 
> > I see nothing about a struct gsmtap_hdr:
> > 	http://osmocom.org/projects/baseband/wiki/GSMTAP
> > that...
> > 	2) would prevent it from being at the beginning of a LINKTYPE_GSMTAP/DLT_GSMTAP packet in a pcap or pcapng file.
> With a specification based on
> 	http://cgit.osmocom.org/libosmocore/plain/include/osmocom/core/gsmtap.h

I completely agree that there is no technical reason why one couldn't put GSMTAP
headers in current (v2) or future formats inside an ETHERTYPE / DLT and have
them natively appearing in a pcap file of the given DLT.  There would be no objections
from my side to do so.

One could then simply call the same dissector in wireshark from that DLT or from
the existing UDP port number based dispatch via the IANA-registered GSMTAP port
number.

However, among the existing users of GSMTAP in the last decade or so,
there would be no advantage, as the related sources of GSMTAP frames all
exist in userspace and are feeding data, particularly from potentially
multiple sources, which can very well run on different hosts.

But that of course doesn't prevent new users from using different
transport mechanisms of getting GSMTAP from e.g. the kernel into
userspace.

Regards,
	Harald
-- 
- Harald Welte <laforge-TgoAw6mPHtdg9hUCZPvPmw@public.gmane.org>           http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-09 13:50 Johannes Berg
     [not found] ` <CAPEnp=bHTVARr7WA9Qkq4=y7kk8_FLWhrkqKOEXubMO4X=BHCw@mail.gmail.com>
     [not found]   ` <CAPEnp=bHTVARr7WA9Qkq4=y7kk8_FLWhrkqKOEXubMO4X=BHCw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-04-10  7:23     ` Johannes Berg
     [not found]       ` <46474c61d7748042cc0a1f23773186786020638e.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2019-04-10  7:57         ` Marcel Holtmann
2019-04-10 23:45         ` Harald Welte
     [not found]       ` <6F1998DC-EFD2-4145-BD81-A80F9DC7ED2D@holtmann.org>
     [not found]         ` <6F1998DC-EFD2-4145-BD81-A80F9DC7ED2D-kz+m5ild9QBg9hUCZPvPmw@public.gmane.org>
2019-04-12 12:12           ` Johannes Berg
     [not found]             ` <1d64c578cd5b254d301cf1cac82f32a062916888.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2019-04-12 19:49               ` Marcel Holtmann
     [not found]             ` <D4D12CF9-9CE5-46FB-9738-F89DB6B6F9EA@holtmann.org>
     [not found]               ` <D4D12CF9-9CE5-46FB-9738-F89DB6B6F9EA-kz+m5ild9QBg9hUCZPvPmw@public.gmane.org>
2019-04-15  9:11                 ` Johannes Berg
     [not found]                   ` <92e8e142b6d441c1c995abc57d64ad7b7747a688.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2019-04-15 10:29                     ` Bjørn Mork
     [not found]                       ` <87d0ln1s0a.fsf-3F4PFWf5pNjpjLOzFPqGjWGXanvQGlWp@public.gmane.org>
2019-04-15 10:41                         ` Johannes Berg
     [not found]       ` <20190410234555.GO25552@nataraja>
2019-04-12 17:15         ` Johannes Berg
     [not found]           ` <f0a64bb751b8c601f58130a7f3a3158d70f18f63.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2019-04-12 19:54             ` Guy Harris
2019-04-13  7:12             ` Harald Welte
2019-04-13  7:49               ` Guy Harris
     [not found]           ` <196E881D-AB4A-4569-9C1F-5BCB41FE832F@alum.mit.edu>
     [not found]             ` <196E881D-AB4A-4569-9C1F-5BCB41FE832F-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2019-04-12 22:47               ` Guy Harris
     [not found]                 ` <1D6FE33B-DC15-47D8-A1AD-E95608300FDC-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2019-04-13  6:41                   ` Harald Welte [this message]
     [not found]                 ` <20190413064152.GB24451@nataraja>
2019-04-13  7:36                   ` Guy Harris
     [not found] ` <cf07ae24c436f92769f9289d208f01846ebe8826.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2019-04-10  6:35   ` Vadim Yanitskiy
2019-04-10 23:32   ` Harald Welte
2019-04-12 12:24     ` Johannes Berg
     [not found]       ` <1462659018bc40830efbe2348791b8df45b54cff.camel-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
2019-04-12 19:48         ` Guy Harris
2019-04-13  7:35         ` Harald Welte
     [not found]       ` <20190413073505.GD24451@nataraja>
2019-04-13  7:55         ` Guy Harris
2019-04-15  9:26         ` Johannes Berg
     [not found]       ` <1089142F-2966-4C41-921B-465FBA721E79@alum.mit.edu>
     [not found]         ` <1089142F-2966-4C41-921B-465FBA721E79-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>
2019-04-15  9:28           ` Johannes Berg

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='20190413064152.GB24451__16203.3970862225$1555138223$gmane$org@nataraja' \
    --to=laforge-tgoaw6mphtdg9huczpvpmw@public.gmane.org \
    --cc=aleksander-Dvg4H30XQSRVIjRurl1/8g@public.gmane.org \
    --cc=axilirator-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
    --cc=bjorn-yOkvZcmFvRU@public.gmane.org \
    --cc=dcbw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
    --cc=guy-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org \
    --cc=johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org \
    --cc=linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=openbsc-qjLDD68F18N4m7O/Vxda39i2O/JbrIOy@public.gmane.org \
    --cc=radiotap-S783fYmB3Ccdnm+yROfE0A@public.gmane.org \
    --cc=stranche-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org \
    --cc=subashab-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

RadioTap Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/radiotap/0 radiotap/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 radiotap radiotap/ https://lore.kernel.org/radiotap \
		radiotap@radiotap.org
	public-inbox-index radiotap

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.netbsd.radiotap


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git