From: Paolo Abeni <pabeni@redhat.com>
To: Paul Moore <paul@paul-moore.com>, Florian Westphal <fw@strlen.de>
Cc: Stephen Smalley <stephen.smalley.work@gmail.com>,
selinux@vger.kernel.org, mptcp@lists.01.org,
linux-security-module@vger.kernel.org
Subject: Re: [MPTCP] Re: [RFC PATCH] selinux: handle MPTCP consistently with TCP
Date: Fri, 04 Dec 2020 11:04:36 +0100 [thread overview]
Message-ID: <8c844984eaa92413066367af69b56194b111ad8f.camel@redhat.com> (raw)
In-Reply-To: <CAHC9VhT-rj=tJwVycS19TgJDQ766oUH6ng+Uv=wu+WDrgE0AHA@mail.gmail.com>
On Thu, 2020-12-03 at 21:24 -0500, Paul Moore wrote:
> On Thu, Dec 3, 2020 at 6:54 PM Florian Westphal <fw@strlen.de> wrote:
> > Paul Moore <paul@paul-moore.com> wrote:
> > > I'm not very well versed in MPTCP, but this *seems* okay to me, minus
> > > the else-crud chunk. Just to confirm my understanding, while MPTCP
> > > allows one TCP connection/stream to be subdivided and distributed
> > > across multiple interfaces, it does not allow multiple TCP streams to
> > > be multiplexed on a single connection, yes?
> >
> > Its the latter. The application sees a TCP interface (socket), but
> > data may be carried over multiple individual tcp streams on the wire.
>
> Hmm, that may complicate things a bit from a SELinux perspective. Maybe not.
>
> Just to make sure I understand, with MPTCP, a client that
> traditionally opened multiple TCP sockets to talk to a server would
> now just open a single MPTCP socket and create multiple sub-flows
> instead of multiple TCP sockets?
I expect most clients will not be updated specifically for MPTCP,
except changing the protocol number at socket creation time - and we
would like to avoid even that.
If a given application creates multiple sockets, it will still do that
with MPTCP. The kernel, according to the configuration provided by the
user-space and/or by the peer, may try to create additional subflows
for each MPTCP sockets, using different local or remote address and/or
port number. Each subflow is represented inside the kernel as a TCP
'struct sock' with specific ULP operations. No related 'struct socket'
is exposed to user-space.
Cheers,
Paolo
next prev parent reply other threads:[~2020-12-04 10:06 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3336b397dda1d15ee9fb87107f9cc21a5d1fe510.1606904940.git.pabeni@redhat.com>
[not found] ` <3a5f156da4569957b91bb5aa4d2a316b729a2c69.camel@redhat.com>
[not found] ` <539f376-62c2-dbe7-fbfd-6dc7a53eafa@linux.intel.com>
2020-12-03 23:30 ` [MPTCP] Re: [RFC PATCH] selinux: handle MPTCP consistently with TCP Paul Moore
2020-12-03 23:54 ` Florian Westphal
2020-12-04 2:24 ` Paul Moore
2020-12-04 10:04 ` Paolo Abeni [this message]
2020-12-04 23:22 ` Paul Moore
2020-12-08 15:35 ` Paolo Abeni
2020-12-08 23:35 ` Paul Moore
2020-12-09 10:02 ` Paolo Abeni
2020-12-10 2:43 ` Paul Moore
Reply instructions:
You may reply publicly 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=8c844984eaa92413066367af69b56194b111ad8f.camel@redhat.com \
--to=pabeni@redhat.com \
--cc=fw@strlen.de \
--cc=linux-security-module@vger.kernel.org \
--cc=mptcp@lists.01.org \
--cc=paul@paul-moore.com \
--cc=selinux@vger.kernel.org \
--cc=stephen.smalley.work@gmail.com \
/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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).