From nobody Wed Oct 4 00:53:18 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C2B2C13295C for ; Wed, 4 Oct 2017 00:53:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.399 X-Spam-Level: X-Spam-Status: No, score=-1.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_SORBS_SPAM=0.5, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KSXCnzBDQ2um for ; Wed, 4 Oct 2017 00:53:14 -0700 (PDT) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [IPv6:2001:200:0:8803::53]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4342713202D for ; Wed, 4 Oct 2017 00:53:13 -0700 (PDT) Received: from mail-qt0-f175.google.com (mail-qt0-f175.google.com [209.85.216.175]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id 800E727874E for ; Wed, 4 Oct 2017 16:53:11 +0900 (JST) Received: by mail-qt0-f175.google.com with SMTP id 34so461762qtb.13 for ; Wed, 04 Oct 2017 00:53:11 -0700 (PDT) X-Gm-Message-State: AMCzsaWxPHjJnHAkkDpKHCqjOauFJvIl5NYEB/0wUrqvdjc/Xzng9Zrb fN8S26kuEtSct2tE8s4+Vlcj2qPTgcK+NwfGUcw= X-Google-Smtp-Source: AOwi7QCm/TooF/uJzviingkJnbYIl8L26y6KJ4P50VlOVwd/ip2/tQvBIKA6kiFFJtET9qenJ8Wtv2+2gsyo1H4t5oc= X-Received: by 10.37.179.9 with SMTP id l9mr3362289ybj.434.1507103590156; Wed, 04 Oct 2017 00:53:10 -0700 (PDT) MIME-Version: 1.0 Received: by 10.37.185.9 with HTTP; Wed, 4 Oct 2017 00:53:09 -0700 (PDT) In-Reply-To: <272695de663e4adca1930203b32f44e7@HE105686.emea1.cds.t-internal.com> References: <64f1b27aee214f6b99b5c474158d7426@HE105686.emea1.cds.t-internal.com> <79ac6cb307784db3a6d8ae1550a49573@HE105686.emea1.cds.t-internal.com> <272695de663e4adca1930203b32f44e7@HE105686.emea1.cds.t-internal.com> From: Yoshifumi Nishida Date: Wed, 4 Oct 2017 00:53:09 -0700 X-Gmail-Original-Message-ID: Message-ID: To: Markus.Amend@telekom.de Cc: multipathtcp Content-Type: multipart/alternative; boundary="f403045f2b0821910d055ab3e6c7" Archived-At: Subject: Re: [multipathtcp] A proposal for MPTCP Robust session Establishment (MPTCP RobE) X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Oct 2017 07:53:17 -0000 --f403045f2b0821910d055ab3e6c7 Content-Type: text/plain; charset="UTF-8" Hi Markus, I still need to think about it a bit more, but here's my current thoughts.. Sorry for slow response. 1: I am guessing we cannot use this approach with TFO yet. But, if TFO cannot be used, it might affect the latency of some apps. 2: Although I am not sure as I'm not an implementor, but I feel it could be a bit tricky to implement MP_JOIN_CAP as servers cannot be sure if this subflow becomes primary or secondary until several packets are exchanged. (also, I'm not sure how to merge connections when TFO is used.) 3: I guess we'll need another step after SA6.2 to verify the response from host B. Also, MP_JOIN_CAP will require extra RTTs when the other end doesn't support it. (because it will need to send RST and MP_JOIN to establish a subflow) 4: I tend to prefer just sending MP_JOIN after SA6.1 for simplicity so far. We might be able to do everything in a shim layer. -- Yoshi On Tue, Sep 19, 2017 at 3:00 AM, wrote: > Dear all, > > any comments to my proposal from two weeks ago? > > BR > > Markus > > > -----Original Message----- > > From: Amend, Markus > > Sent: Montag, 4. September 2017 14:17 > > To: multipathtcp@ietf.org > > Subject: RE: [multipathtcp] A proposal for MPTCP Robust session > > Establishment (MPTCP RobE) > > > > Dear all, > > > > Based on feedback at IETF99, regarding MPTCP RobE proposal > > (https://datatracker.ietf.org/meeting/99/materials/slides-99-mptcp-a- > > proposal-for-mptcp-robust-session-establishment-mptcp-robe), I > completely > > reconsider the original approach, I presented. Remember, the "Downgrade"- > > approach (see slides) was preferred from my side, because it combines > > robustness and a huge latency reduction. > > > > The main feedback I got was: > > > > (1) Relying on SYN-Key-A as identifier to combine potential initial > flows, raise > > several issues > > (1.1) not available in RFC6824bis anymore > > (1.2) security, because > > (1.2.1) Key-A is transmitted many times > > (1.2.2) can be abused by accident/intend > > (2) Separate robustness and latency functionality > > (3) To much computing resources needed on receiver side to detect > > duplicate Key-A > > (4) Do it in the application layer library (build a shim layer); not > in the > > MPTCP standard and/or implementation to reduce complexity > > > > With the following reworked proposal (based on the "Downgrade" approach, > > see slides), I try to address all of the points above. > > > > With Fig. 1, the flow diagram for the new proposal is depicted. It is > referred > > to MPTCP version 0, but should be equivalent to probable version 1 > > (RFC6284bis), just without a SYN-MP_CAPABLE containing Key-A. > > To reach robustness, several separate MPTCP initial flows are initiated > at the > > beginning, in the following denoted as "potential initial flows". In > step SA1 > > and SA2, respectively SB3 and SB4, standard MPTCP initial flow procedure > is > > applied, so no change so far. With occurring SA3/SA4 the requester "Host > A" > > has to decide which potential initial flow will be used further as > initial flow > > (e.g. the first which returns) and what shall happen with the other > potential > > flows. Either it can break all but one (e.g. sending RST at SA6.1) OR > recycle > > them (step SA6.2). Thereby, it is a full client side decision to use > robustness > > only or benefit from latency reduction as well and can be toggled > separately > > by e.g. sysctl globally and/or socket option. > > Until SA6.1, it doesn't require any MPTCP standard modification! > > > > Host A Host B > > ------------------------ ---------- > > Address A1 Address A2 Address B1 > > ---------- ---------- ---------- > > | | | > > | SYN + MP_CAPABLE(Key-A) | > > (SA1) |--------------------------------------------->| (SB1) > > | | SYN + MP_CAPABLE(Key-A') | > > (SA2) | |------------------------------->| (SB2) > > | | | > > (SA3) |<---------------------------------------------| (SB3) > > | SYN/ACK + MP_CAPABLE(Key-B) | > > (SA4) | |<-------------------------------| (SB4) > > | | SYN/ACK + MP_CAPABLE(Key-B') | > > | | | > > | ACK + MP_CAPABLE(Key-A, Key-B) | > > (SA5) |--------------------------------------------->| (SB5) > > | | RST | > > (SA6.1) | |------------------------------->| (SB6.1) > > robust | | | > > ness | | | > > ------------------------------------------------------------------- > > latency | | | > > red. | | ACK + MP_JOIN_CAP(Key-A, HMAC) | > > (SA6.2) | |------------------------------->| (SB6.2) > > > > Key-B_fast_hash = crc16(Key-B) & 0x3FF -> (10bit) > > HMAC_keys = HMAC(Key-A+Key-B+Key-B') -> (>=96bit) > > HMAC = (HMAC_keys & ~0x3FF) | Key-B_fast_hash -> (size same as > > HMAC_keys) > > > > Figure 1: Example Use of MPTCP RobE (for MPTCP version 0) > > > > For not wasting resources by breaking all but one and benefit in addition > > from a huge latency reduction (see MPTCP RobE proposal, p.12,14+15,17), > > one can make use of a new proposed MPTCP option "MP_JOIN_CAP", > > illustrated in Fig. 2. According to Fig. 1, A1<->B1 is assumed as > initial flow at > > SA3 and A2<->B1 shall be recycled at SA6.2 (SA6.1 is skipped therefore). > > Instead of sending an MP_CAPABLE in the third ACK, an MP_JOIN_CAP is > > sent, which includes Key-A of the selected initial flow A1<->B1 and an > HMAC, > > coding Key-A, Key-B, Key-B' in a determined way (see Fig. 1 bottom). > > > > 1 2 3 > > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 > > +---------------+---------------+-------+-------+---------------+ > > | Kind | Length |Subtype| | ADDR_ID | > > +---------------+---------------+-------+-------+---------------+ > > | Sender's Key-A (64 bits) | > > | | > > | | > > +---------------------------------------------------------------+ > > | HMAC (>=96 bits) | > > | | > > | | > > : : > > +---------------------------------------------------------------+ > > Figure 2: Multipath Join Capable (MP_JOIN_CAP) Option (for Third > > MP_CAPABLE ACK) > > > > For the MP_CAPABLE, ADDR_ID is set to zero (like RFC6824) and for > > MP_JOIN_CAP it is sent with. > > > > Which boundary conditions can happen: > > > > 1. Like Fig. 1, A1<->B1 is assumed as initial flow and MP_CAPABLE > receives > > first at Host B (SB5), A2<->B1 shall be recycled and ACK is sent with > > MP_JOIN_CAP > > If MP_JOIN_CAP is received it has to iterate once (like MP_JOIN) the > > connection list and check for Key-A availability. If a Key-A connection > is > > found, it is validated against HMAC value. The validation has two > reasons, > > firstly several Key-A can exist, because different Hosts choose same > Key-A by > > accident. Furthermore no one can join a connection by just > recording/brute- > > forcing Key-A and duplicate the request. (solves point (1) from the > feedback) > > > > 2. Like 1., but MP_JOIN_CAP arrives before the MP_CAPABLE at Host B > > > > 2.1 draft-ietf-mptcp-rfc6824bis-09 > > Based on Key-A, it will iterate over the connection list, but it > will not > > match, because Key-A from formerly selected initial flow hasn't arrived > yet. > > So it will continue with a fast iterate only over the connections, which > are still > > in establishment phase, using the 10bit Key-B_fast_hash (crc16(Key-B) & > > 0x3FF). If it matches against a (precomputed) existing Key-B_fast_hash > in the > > connection list, it will validate with the HMAC(Key-A+Key-B+Key-B') > again to > > ensure legitimation. If successful, both, the initial flow and the > MP_JOIN_CAP > > flow, can be immediately established. This is true, because without the > > knowledge of Key-B, Host A couldn't calculate the HMAC. So it is clear, > that > > host A had received the SYN/ACK (SB3). > > This also mitigates the requirement of a reliable ACK (draft-ietf-mptcp- > > rfc6824bis-09, p.15) exchange, because only one > > MP_CAPABLE/MP_JOIN_CAP needs to reach receiver side. > > > > 2.2 MPTCP version 0 (RFC6824) > > Can match based on Key-A, like 1., same effort as for a MP_JOIN. > > > > 3. A2<->B1 is selected as initial flow, because according SYN/ACK returns > > earlier at Host A. > > It is the same as 1. and 2., just the other way round :-) > > > > With these boundary conditions it has been shown, that no additional > > computing resources are required (see feedback (3)), compared to todays > > MPTCP, with a minimal exception of 2.1. > > > > With such a simple approach, and by adding an inconspicuous simple MPTCP > > option MP_JOIN_CAP, MPTCP would be extended towards robustness and if > > desired, latency reduction can be enabled on top, but obviously requires > > receiver support. Negotiation is inherently given by the new MP_JOIN_CAP > > which is either accepted or not. If not, the standard MP_JOIN process > can be > > applied. > > > > Because of such a simplicity and the massive benefit by optional latency > > reduction, I still believe it fits best in the MPTCP layer itself and > not in an > > application shim layer (see feedback (4)). > > > > Due to the separation of robustness and latency reduction functionality, > it > > offers the chance to implement "robustness" in plain TCP as well. It > could > > look the same like in Fig. 1, (SA1)-(SA6.1), just without MP_CAPABLE > option. > > But be aware, it needs some kind of path management, which is already > > present in MPTCP, but not in TCP. Furthermore I assume "robustness" is a > > topic more related to taps working group, whereas "latency reduction" is > > related to MPTCP obviously and depends on "robustness"! > > > > BR > > > > Markus > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp > --f403045f2b0821910d055ab3e6c7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Markus,

I still need to think about = it a bit more, but here's my current thoughts.. Sorry for slow response= .

1: I am guessing we cannot use this approach wit= h TFO yet. But, if TFO cannot be used, it might affect the latency of some = apps.

2: Although I am not sure as I'm not an = implementor, but I feel it could be a bit tricky to implement MP_JOIN_CAP a= s servers cannot be sure if this subflow becomes primary or secondary until= several packets are exchanged. (also, I'm not sure how to merge connec= tions when TFO is used.)
=C2=A0
3: I guess we'll ne= ed another step after SA6.2 to verify the response from host B.
= =C2=A0 =C2=A0 Also, MP_JOIN_CAP will require extra RTTs when the other end = doesn't support it. (because it will need to send RST and MP_JOIN to es= tablish a subflow)
=C2=A0 =C2=A0
4: I tend to prefer ju= st sending MP_JOIN after SA6.1 for simplicity so far. We might be able to d= o everything in a shim layer.

--
Yoshi
=C2=A0
On Tue= , Sep 19, 2017 at 3:00 AM, <Markus.Amend@telekom.de> = wrote:
Dear all,

any comments to my proposal from two weeks ago?

BR

Markus

> -----Original Message-----
> From: Amend, Markus
> Sent: Montag, 4. September 2017 14:17
> To: multipa= thtcp@ietf.org
> Subject: RE: [multipathtcp] A proposal for MPTCP Robust session
> Establishment (MPTCP RobE)
>
> Dear all,<= br> >
> Based on feedback at IETF99, regarding MPTCP RobE proposal
> (https://datatracker.ietf.o= rg/meeting/99/materials/slides-99-mptcp-a-
> proposal-for-mptcp-robust-session-establishment-mptcp-robe), I co= mpletely
> reconsider the original approach, I presented. Remember, the "Dow= ngrade"-
> approach (see slides) was preferred from my side, because it combines<= br> > robustness and a huge latency reduction.
>
> The main feedback I got was:
>
>=C2=A0 =C2=A0(1) Relying on SYN-Key-A as identifier to combine potentia= l initial flows, raise
> several issues
>=C2=A0 =C2=A0 =C2=A0(1.1) not available in RFC6824bis anymore
>=C2=A0 =C2=A0 =C2=A0(1.2) security, because
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(1.2.1) Key-A is transmitted many tim= es
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(1.2.2) can be abused by accident/int= end
>=C2=A0 =C2=A0(2) Separate robustness and latency functionality
>=C2=A0 =C2=A0(3) To much computing resources needed on receiver side to= detect
> duplicate Key-A
>=C2=A0 =C2=A0(4) Do it in the application layer library (build a shim l= ayer); not in the
> MPTCP standard and/or implementation to reduce complexity
>
> With the following reworked proposal (based on the "Downgrade&quo= t; approach,
> see slides), I try to address all of the points above.
>
> With Fig. 1, the flow diagram for the new proposal is depicted. It is = referred
> to MPTCP version 0, but should be equivalent to probable version 1
> (RFC6284bis), just without a SYN-MP_CAPABLE containing Key-A.
> To reach robustness, several separate MPTCP initial flows are initiate= d at the
> beginning, in the following denoted as "potential initial flows&q= uot;. In step SA1
> and SA2, respectively SB3 and SB4, standard MPTCP initial flow procedu= re is
> applied, so no change so far. With occurring SA3/SA4 the requester &qu= ot;Host A"
> has to decide which potential initial flow will be used further as ini= tial flow
> (e.g. the first which returns) and what shall happen with the other po= tential
> flows. Either it can break all but one (e.g. sending RST at SA6.1) OR = recycle
> them (step SA6.2). Thereby, it is a full client side decision to use r= obustness
> only or benefit from latency reduction as well and can be toggled sepa= rately
> by e.g. sysctl globally and/or socket option.
> Until SA6.1, it doesn't require any MPTCP standard modification! >
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Host A=C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Host B
>=C2=A0 =C2=A0 =C2=A0 ------------------------=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0----------
>=C2=A0 =C2=A0 =C2=A0 Address A1=C2=A0 =C2=A0 Address A2=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Addres= s B1
>=C2=A0 =C2=A0 =C2=A0 ----------=C2=A0 =C2=A0 ----------=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0------= ----
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 SYN + MP_CAPABLE(Key-A)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| >=C2=A0 (SA1)=C2=A0 =C2=A0|----------------------------------------= ----->|=C2=A0 (SB1)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0|=C2=A0 =C2=A0 SYN + MP_CAPABLE(Key-A')=C2=A0 =C2=A0 |
>=C2=A0 (SA2)=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0|------------------------------->|=C2=A0 (SB2)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |
>=C2=A0 (SA3)=C2=A0 =C2=A0|<------------------------------------= ---------|=C2=A0 (SB3)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = SYN/ACK + MP_CAPABLE(Key-B)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
>=C2=A0 (SA4)=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0|<-------------------------------|=C2=A0 (SB4)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0|=C2=A0 =C2=A0SYN/ACK + MP_CAPABLE(Key-B') |
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 ACK + M= P_CAPABLE(Key-A, Key-B)=C2=A0 =C2=A0 =C2=A0 =C2=A0 |
>=C2=A0 (SA5)=C2=A0 =C2=A0|----------------------------------------= ----->|=C2=A0 (SB5)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0RST=C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |
>=C2=A0 (SA6.1) |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|------= ------------------------->|=C2=A0 (SB6.1)
> robust=C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |
> ness=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |
> ------------------------------------------------------------= -------
> latency=C2=A0 |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |
> red.=C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0| ACK + MP_JOIN_CAP(Key-A, HMAC) |
>=C2=A0 (SA6.2) |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|------= ------------------------->|=C2=A0 (SB6.2)
>
>=C2=A0 =C2=A0 Key-B_fast_hash =3D crc16(Key-B) & 0x3FF=C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-> (10bit)
>=C2=A0 =C2=A0 HMAC_keys =3D=C2=A0 HMAC(Key-A+Key-B+Key-B')=C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -> (>=3D96bit)
>=C2=A0 =C2=A0 HMAC =3D=C2=A0 (HMAC_keys & ~0x3FF) | Key-B_fast_hash= =C2=A0 =C2=A0 =C2=A0 =C2=A0-> (size same as
> HMAC_keys)
>
> Figure 1: Example Use of MPTCP RobE (for MPTCP version 0)
>
> For not wasting resources by breaking all but one and benefit in addit= ion
> from a huge latency reduction (see MPTCP RobE proposal, p.12,14+15,17)= ,
> one can make use of a new proposed MPTCP option "MP_JOIN_CAP"= ;,
> illustrated in Fig. 2. According to Fig. 1, A1<->B1 is assumed a= s initial flow at
> SA3 and A2<->B1 shall be recycled at SA6.2 (SA6.1 is skipped the= refore).
> Instead of sending an MP_CAPABLE in the third ACK, an MP_JOIN_CAP is > sent, which includes Key-A of the selected initial flow A1<->B1 = and an HMAC,
> coding Key-A, Key-B, Key-B' in a determined way (see Fig. 1 bottom= ).
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 1= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A02=C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A03
>=C2=A0 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1<= br> > +---------------+---------------+-------+-------+-----------= ----+
> |=C2=A0 =C2=A0 =C2=A0Kind=C2=A0 =C2=A0 =C2=A0 |=C2=A0 =C2=A0 Length=C2= =A0 =C2=A0 =C2=A0|Subtype|=C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 ADDR_ID= =C2=A0 =C2=A0 |
> +---------------+---------------+-------+-------+-----------= ----+
> |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= Sender's Key-A (64 bits)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0|
> |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0|
> |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0|
> +-----------------------------------------------------------= ----+
> |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 HMAC (>=3D96 bits)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
> |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0|
> |=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0|
> :=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0:
> +-----------------------------------------------------------= ----+
> Figure 2: Multipath Join Capable (MP_JOIN_CAP) Option (for Third
> MP_CAPABLE ACK)
>
> For the MP_CAPABLE, ADDR_ID is set to zero (like RFC6824) and for
> MP_JOIN_CAP it is sent with.
>
> Which boundary conditions can happen:
>
> 1. Like Fig. 1, A1<->B1 is assumed as initial flow and MP_CAPABL= E receives
> first at Host B (SB5), A2<->B1 shall be recycled and ACK is sent= with
> MP_JOIN_CAP
>=C2=A0 =C2=A0 If MP_JOIN_CAP is received it has to iterate once (like M= P_JOIN) the
> connection list and check for Key-A availability. If a Key-A connectio= n is
> found, it is validated against HMAC value. The validation has two reas= ons,
> firstly several Key-A can exist, because different Hosts choose same K= ey-A by
> accident. Furthermore no one can join a connection by just recording/b= rute-
> forcing Key-A and duplicate the request. (solves point (1) from the fe= edback)
>
> 2. Like 1., but MP_JOIN_CAP arrives before the MP_CAPABLE at Host B >
>=C2=A0 =C2=A0 =C2=A02.1 draft-ietf-mptcp-rfc6824bis-09
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Based on Key-A, it will iterate over = the connection list, but it will not
> match, because Key-A from formerly selected initial flow hasn't ar= rived yet.
> So it will continue with a fast iterate only over the connections, whi= ch are still
> in establishment phase, using the 10bit Key-B_fast_hash (crc16(Key-B) = &
> 0x3FF). If it matches against a (precomputed) existing Key-B_fast_hash= in the
> connection list, it will validate with the HMAC(Key-A+Key-B+Key-B'= ) again to
> ensure legitimation. If successful, both, the initial flow and the MP_= JOIN_CAP
> flow, can be immediately established. This is true, because without th= e
> knowledge of Key-B, Host A couldn't calculate the HMAC. So it is c= lear, that
> host A had received the SYN/ACK (SB3).
> This also mitigates the requirement of a reliable ACK (draft-ietf-mptc= p-
> rfc6824bis-09, p.15) exchange, because only one
> MP_CAPABLE/MP_JOIN_CAP needs to reach receiver side.
>
>=C2=A0 =C2=A0 =C2=A02.2 MPTCP version 0 (RFC6824)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Can match based on Key-A, like 1., sa= me effort as for a MP_JOIN.
>
> 3. A2<->B1 is selected as initial flow, because according SYN/AC= K returns
> earlier at Host A.
>=C2=A0 =C2=A0 =C2=A0It is the same as 1. and 2., just the other way rou= nd :-)
>
> With these boundary conditions it has been shown, that no additional > computing resources are required (see feedback (3)), compared to today= s
> MPTCP, with a minimal exception of 2.1.
>
> With such a simple approach, and by adding an inconspicuous simple MPT= CP
> option MP_JOIN_CAP, MPTCP would be extended towards robustness and if<= br> > desired, latency reduction can be enabled on top, but obviously requir= es
> receiver support. Negotiation is inherently given by the new MP_JOIN_C= AP
> which is either accepted or not. If not, the standard MP_JOIN process = can be
> applied.
>
> Because of such a simplicity and the massive benefit by optional laten= cy
> reduction, I still believe it fits best in the MPTCP layer itself and = not in an
> application shim layer (see feedback (4)).
>
> Due to the separation of robustness and latency reduction functionalit= y, it
> offers the chance to implement "robustness" in plain TCP as = well. It could
> look the same like in Fig. 1, (SA1)-(SA6.1), just without MP_CAPABLE o= ption.
> But be aware, it needs some kind of path management, which is already<= br> > present in MPTCP, but not in TCP. Furthermore I assume "robustnes= s" is a
> topic more related to taps working group, whereas "latency reduct= ion" is
> related to MPTCP obviously and depends on "robustness"!
>
> BR
>
> Markus
__________= _____________________________________
multipathtcp mailing list
multipathtcp@iet= f.org
https://www.ietf.org/mailman/listinfo/multipa= thtcp

--f403045f2b0821910d055ab3e6c7-- From nobody Mon Oct 16 13:11:59 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C1711132F8F for ; Mon, 16 Oct 2017 13:11:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.5 X-Spam-Level: X-Spam-Status: No, score=0.5 tagged_above=-999 required=5 tests=[BAYES_40=-0.001, HTML_MESSAGE=0.001, RCVD_IN_SORBS_SPAM=0.5, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Wb7hdH-Nx-qt for ; Mon, 16 Oct 2017 13:11:56 -0700 (PDT) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [IPv6:2001:200:0:8803::53]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 29034124B18 for ; Mon, 16 Oct 2017 13:11:55 -0700 (PDT) Received: from mail-wm0-f41.google.com (mail-wm0-f41.google.com [74.125.82.41]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id 22DD427834E for ; Tue, 17 Oct 2017 05:11:53 +0900 (JST) Received: by mail-wm0-f41.google.com with SMTP id q124so6297793wmb.0 for ; Mon, 16 Oct 2017 13:11:53 -0700 (PDT) X-Gm-Message-State: AMCzsaUiaLeLWDE1KsVJWzp8SYATkfe+mmYyVBlasyX2vIu843i3fb7Y s3c/iT2GAlnhvprptY1WvSTM9ZBH1n8Fgm9qiZk= X-Google-Smtp-Source: ABhQp+Qpncns5+qEPB1iSiLSKJJ8svnk4OHbGlv2FfxqHWT08BWoutdeRiAhwgkLc1VbptIF0q6KffBgH9FgqHg12jw= X-Received: by 10.28.105.76 with SMTP id e73mr1923402wmc.116.1508184711191; Mon, 16 Oct 2017 13:11:51 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.171.232 with HTTP; Mon, 16 Oct 2017 13:11:50 -0700 (PDT) From: Yoshifumi Nishida Date: Mon, 16 Oct 2017 13:11:50 -0700 X-Gmail-Original-Message-ID: Message-ID: To: multipathtcp Content-Type: multipart/alternative; boundary="001a1147c4eaf76410055baf9df8" Archived-At: Subject: [multipathtcp] Agenda for mptcp meeting at IETF 100 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Oct 2017 20:11:58 -0000 --001a1147c4eaf76410055baf9df8 Content-Type: text/plain; charset="UTF-8" Hello, According to the current preliminary agenda ( https://datatracker.ietf.org/meeting/100/agenda.html), we will have a 2-hour meeting slot on 11/14 Tuesday afternoon (15:50 -17:50). (Please note this might be changed as it's still preliminary) If you're planning to present something, please provide us the following info. 1: presenter's name 2: title 3: length of the presentation Thanks, -- Yoshi & Phil --001a1147c4eaf76410055baf9df8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello,
According to the curren= t preliminary=C2=A0agenda=C2=A0(https://datatracker.ietf.org/= meeting/100/agenda.html), we will have a 2-hour meeting slot on 11/14 T= uesday afternoon (15:50 -17:50). (Please note this might be changed as it&#= 39;s still preliminary)

If you're planning to= present something, please provide us the following info.=C2=A0

=C2=A0 =C2=A01: presenter's name
=C2=A0 =C2=A02: title=
=C2=A0 =C2= =A03: length of the presentation

Thanks,--
Yoshi & Phi= l
--001a1147c4eaf76410055baf9df8-- From nobody Fri Oct 20 17:28:48 2017 Return-Path: X-Original-To: multipathtcp@ietf.org Delivered-To: multipathtcp@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id AFD76134518; Fri, 20 Oct 2017 17:24:23 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "\"IETF Secretariat\"" To: , Cc: multipathtcp@ietf.org, ietf@kuehlewind.net X-Test-IDTracker: no X-IETF-IDTracker: 6.63.2 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <150854546371.20809.4184500071528602501.idtracker@ietfa.amsl.com> Date: Fri, 20 Oct 2017 17:24:23 -0700 Archived-At: Subject: [multipathtcp] mptcp - Requested session has been scheduled for IETF 100 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Oct 2017 00:24:24 -0000 Dear Philip Eardley, The session(s) that you have requested have been scheduled. Below is the scheduled session information followed by the original request. mptcp Session 1 (2:00:00) Tuesday, Afternoon Session II 1550-1750 Room Name: Collyer size: 250 --------------------------------------------- Request Information: --------------------------------------------------------- Working Group Name: Multipath TCP Area Name: Transport Area Session Requester: Philip Eardley Number of Sessions: 1 Length of Session(s): 2 Hours Number of Attendees: 60 Conflicts to Avoid: First Priority: ippm tcpinc tcpm tsvarea tsvwg tls banana Second Priority: taps iccrg rtcweb manet Third Priority: nfvrg quic maprg People who must be present: Yoshifumi Nishida Philip Eardley Mirja Kuehlewind Resources Requested: Special Requests: please avoid any transport area BoFs --------------------------------------------------------- From nobody Mon Oct 23 01:47:29 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E440513F15C for ; Mon, 23 Oct 2017 01:47:27 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.401 X-Spam-Level: X-Spam-Status: No, score=-5.401 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-2.8, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hhWFh4v8uLmp for ; Mon, 23 Oct 2017 01:47:25 -0700 (PDT) Received: from smtpb1.bt.com (smtpb1.bt.com [62.7.242.136]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 25E6813F159 for ; Mon, 23 Oct 2017 01:47:24 -0700 (PDT) Received: from EPDAG01D-UKBR.domain1.systemhost.net (193.113.197.205) by EVMED02-UKBR.bt.com (10.216.161.32) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 23 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X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.202.242] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [multipathtcp] Multipath TCP FAST_CLOSE - abrupt closing X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Oct 2017 08:47:28 -0000 RGlkIHdlIHJlYWNoIGNvbnNlbnN1cyBhYm91dCB0aGlzIHByb3Bvc2VkIGNoYW5nZT8NClRoYW5r cw0KcGhpbA0KDQotLS0tLU9yaWdpbmFsIE1lc3NhZ2UtLS0tLQ0KRnJvbTogbXVsdGlwYXRodGNw IFttYWlsdG86bXVsdGlwYXRodGNwLWJvdW5jZXNAaWV0Zi5vcmddIE9uIEJlaGFsZiBPZiBGcmFu w6dvaXMgRmluZmUNClNlbnQ6IDEzIFNlcHRlbWJlciAyMDE3IDE0OjM5DQpUbzogbXVsdGlwYXRo dGNwQGlldGYub3JnDQpDYzogT2xpdmllciBCb25hdmVudHVyZSA8b2xpdmllci5ib25hdmVudHVy 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YXRlbHkgYnkgZS1tYWlsIGlmIHlvdSBoYXZlIHJlY2VpdmVkIHRoaXMgZS1tYWlsIGJ5IG1pc3Rh a2UgYW5kIGRlbGV0ZSB0aGlzIGUtbWFpbCBmcm9tIHlvdXIgc3lzdGVtLiBJZiB5b3UgYXJlIG5v dCB0aGUgaW50ZW5kZWQgcmVjaXBpZW50IHlvdSBhcmUgbm90aWZpZWQgdGhhdCBkaXNjbG9zaW5n LCBjb3B5aW5nLCBkaXN0cmlidXRpbmcgb3IgdGFraW5nIGFueSBhY3Rpb24gaW4gcmVsaWFuY2Ug b24gdGhlIGNvbnRlbnRzIG9mIHRoaXMgaW5mb3JtYXRpb24gaXMgc3RyaWN0bHkgcHJvaGliaXRl ZC4NCg0KX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18NCm11 bHRpcGF0aHRjcCBtYWlsaW5nIGxpc3QNCm11bHRpcGF0aHRjcEBpZXRmLm9yZw0KaHR0cHM6Ly93 d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby9tdWx0aXBhdGh0Y3ANCg== From nobody Mon Oct 23 01:48:57 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 35BA513F177 for ; Mon, 23 Oct 2017 01:48:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, WEIRD_PORT=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6c2pg3l8ZzRi for ; Mon, 23 Oct 2017 01:48:54 -0700 (PDT) Received: from smtpb1.bt.com (smtpb1.bt.com [62.7.242.141]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3E09813F17A for ; Mon, 23 Oct 2017 01:48:54 -0700 (PDT) Received: from E07HT05-UKBR.domain1.systemhost.net (193.113.197.167) by EVMED05-UKBR.bt.com (10.216.161.37) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 23 Oct 2017 09:48:47 +0100 Received: from rew09926dag03a.domain1.systemhost.net (10.55.202.18) by E07HT05-UKBR.domain1.systemhost.net (193.113.197.167) with Microsoft SMTP Server (TLS) id 8.3.342.0; Mon, 23 Oct 2017 09:48:51 +0100 Received: from rew09926dag03b.domain1.systemhost.net (10.55.202.22) by rew09926dag03a.domain1.systemhost.net (10.55.202.18) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Mon, 23 Oct 2017 09:48:51 +0100 Received: from rew09926dag03b.domain1.systemhost.net ([fe80::d514:fe50:560c:401e]) by rew09926dag03b.domain1.systemhost.net ([fe80::d514:fe50:560c:401e%12]) with mapi id 15.00.1293.004; Mon, 23 Oct 2017 09:48:51 +0100 From: To: Thread-Topic: Changes to RFC6824bis Thread-Index: AdMF4tNWzyK6qEchQXuzuihLvNQscwggXS1gCV3ZedA= Date: Mon, 23 Oct 2017 08:48:50 +0000 Message-ID: <024cc75349d249b1b62df41ee5840125@rew09926dag03b.domain1.systemhost.net> References: <6ad50c5f057742c096fdd1f9088e551d@rew09926dag03b.domain1.systemhost.net> <7a02a641ed684b3c8aa8e7899e5624ee@rew09926dag03b.domain1.systemhost.net> In-Reply-To: <7a02a641ed684b3c8aa8e7899e5624ee@rew09926dag03b.domain1.systemhost.net> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.202.242] Content-Type: multipart/alternative; boundary="_000_024cc75349d249b1b62df41ee5840125rew09926dag03bdomain1sy_" MIME-Version: 1.0 Archived-At: Subject: Re: [multipathtcp] Changes to RFC6824bis X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Oct 2017 08:48:56 -0000 --_000_024cc75349d249b1b62df41ee5840125rew09926dag03bdomain1sy_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Is there any news about #2 and #3 below? Thanks phil From: Eardley,PL,Philip,TUD1 R Sent: 05 September 2017 17:32 To: Eardley,PL,Philip,TUD1 R ; multipathtcp@ietf.org Subject: RE: Changes to RFC6824bis Just wanted to check where we are re these 3 changes. #1 - thanks to Alan for making this change #2 - Christoph, Olivier - any news? #3 - Quentin - any news? Thanks! Phil From: multipathtcp [mailto:multipathtcp-bounces@ietf.org] On Behalf Of phil= ip.eardley@bt.com Sent: 26 July 2017 08:51 To: multipathtcp@ietf.org Subject: [multipathtcp] Changes to RFC6824bis Hi, During the discussions in Prague, we had good agreement about the following= change to the bis. This is a change to the wire protocol. Please say as so= on as possible if you disagree with this change, otherwise we'll go ahead a= nd make this change:- Remove address identifier from MP-PRIO, as it can be used as an attack. Explanation at https://mailarchive.ietf.org/arch/msg/multipathtcp/WWWaQ3AKW= EMgsBSPKc_R9Ct_YoI and follow up emails. The issue was briefly summarised d= uring the Friday meeting in Prague - eg see the etherpad for a summary http= ://etherpad.tools.ietf.org:9000/p/notes-ietf-99-mptcp?useMonospaceFont=3Dtr= ue Alan - are you ok to make this change please? -- In addition, we agreed in principle to the following (informational) change= s to the bis - exact text to be proposed. 2. Guidance about MPTCP & TFP interactions, based on https://www.ietf= .org/proceedings/99/slides/slides-99-mptcp-sessb-mptcp-tfo-00.pdf - Christo= ph & Olivier, please propose text. 3. There was a suggestion, arising from the hackathon, to discuss on = the list whether clarifications or extra 'reason codes' would be useful in = the context of reset option. Quentin (& others), please make a proposal. Best wishes, Phil & Yoshi --_000_024cc75349d249b1b62df41ee5840125rew09926dag03bdomain1sy_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Is there a= ny news about #2 and #3 below?

Thanks

phil<= /o:p>

From: = Eardley,PL,Philip,TUD1 R
Sent: 05 September 2017 17:32
To: Eardley,PL,Philip,TUD1 R <philip.eardley@bt.com>; multipat= htcp@ietf.org
Subject: RE: Changes to RFC6824bis

 

Just wanted to check whe= re we are re these 3 changes.

#1 – thanks to Ala= n for making this change

#2 – Christoph, Ol= ivier – any news?

#3 – Quentin ̵= 1; any news?

Thanks!

Phil

 = ;

 

Hi,

During the discussions in Prague, we had good agreement about the = following change to the bis. This is a change to the wire protocol. Please = say as soon as possible if you disagree with this change, otherwise we’ll go ahead and make this change:-

Remove= address identifier from MP-PRIO, as it can be used as an attack.

Explan= ation at https://mailarchive.ietf.org/arch/msg/multipathtcp/WWWaQ3AKWEMgsBSPKc_R9Ct_= YoI and follow up emails. The issue was briefly summarised during the F= riday meeting in Prague – eg see the etherpad for a summary http://etherpad.tools.ietf.org:9000/p/notes-ietf-99-mptcp?useMonospaceFont= =3Dtrue

Alan &= #8211; are you ok to make this change please?

--

In add= ition, we agreed in principle to the following (informational) changes to t= he bis – exact text to be proposed.

2.    &nbs= p;  Guidance about MPTCP & TFP interactio= ns, based on https://www.ietf.org/proceedings/99/slides/slides-99-mptcp-sessb-mptcp-tfo-= 00.pdf - Christoph & Olivier, please propose text.

3.    &nbs= p;  There was a suggestion, arising from the hackathon= , to discuss on the list whether clarifications or extra ‘reason code= s’ would be useful in the context of reset option. Quentin (& oth= ers), please make a proposal.

Best wishes,

Phil & Yoshi

 

--_000_024cc75349d249b1b62df41ee5840125rew09926dag03bdomain1sy_-- From nobody Mon Oct 23 01:52:22 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4FF3113F1E4 for ; Mon, 23 Oct 2017 01:52:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.399 X-Spam-Level: X-Spam-Status: No, score=-5.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-2.8, SPF_PASS=-0.001, WEIRD_PORT=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dk2pnqHrgM3K for ; Mon, 23 Oct 2017 01:52:19 -0700 (PDT) Received: from smtpb1.bt.com (smtpb1.bt.com [62.7.242.136]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F2F2913F1E0 for ; Mon, 23 Oct 2017 01:52:17 -0700 (PDT) Received: from E07HT02-UKBR.domain1.systemhost.net (193.113.197.160) by EVMED02-UKBR.bt.com (10.216.161.32) with Microsoft SMTP Server (TLS) id 14.3.319.2; Mon, 23 Oct 2017 09:52:11 +0100 Received: from rew09926dag03d.domain1.systemhost.net (10.55.202.30) by E07HT02-UKBR.domain1.systemhost.net (193.113.197.160) with Microsoft SMTP Server (TLS) id 8.3.342.0; Mon, 23 Oct 2017 09:52:15 +0100 Received: from rew09926dag03b.domain1.systemhost.net (10.55.202.22) by rew09926dag03d.domain1.systemhost.net (10.55.202.30) with Microsoft SMTP Server (TLS) id 15.0.1293.2; Mon, 23 Oct 2017 09:52:15 +0100 Received: from rew09926dag03b.domain1.systemhost.net ([fe80::d514:fe50:560c:401e]) by rew09926dag03b.domain1.systemhost.net ([fe80::d514:fe50:560c:401e%12]) with mapi id 15.00.1293.004; Mon, 23 Oct 2017 09:52:15 +0100 From: To: Thread-Topic: Finishing RFC6824bis Thread-Index: AdMF5BJq4+8S67w/R2Sl1/JdvcshdxF97+gQAAAW6CA= Date: Mon, 23 Oct 2017 08:52:14 +0000 Message-ID: <162e9b4c97b44700affb0b1096cdea7e@rew09926dag03b.domain1.systemhost.net> References: <8efe9632021940bbac21fc1d12fa4539@rew09926dag03b.domain1.systemhost.net> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.55.202.242] Content-Type: multipart/alternative; boundary="_000_162e9b4c97b44700affb0b1096cdea7erew09926dag03bdomain1sy_" MIME-Version: 1.0 Archived-At: Subject: Re: [multipathtcp] Finishing RFC6824bis X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Oct 2017 08:52:21 -0000 --_000_162e9b4c97b44700affb0b1096cdea7erew09926dag03bdomain1sy_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, << Implementers - implement SHA-256. As I understand it, this is the only p= art of the bis for which we don't have at least one implementation. Is ther= e any timescale for implementing this?>> I was wondering if there was an update or plans about this. Alternatively, = we may decide it's ok to go ahead with last call without an implementation = for this aspect. Thanks phil From: Eardley,PL,Philip,TUD1 R Sent: 26 July 2017 15:46 To: Eardley,PL,Philip,TUD1 R > Subject: Finishing RFC6824bis We are close to finalising the bis and being able to WG Last call and send = it to the IESG. Here's a list of actions. If we've forgotten anything, or a= nyone has another mod /addition to the bis, please say. 1. Make the changes agreed - see email below. 2. Implementers - implement SHA-256. As I understand it, this is the o= nly part of the bis for which we don't have at least one implementation. Is= there any timescale for implementing this? 3. Chairs /all - list of changes between RFC & bis, along with a short= justification 4. Chairs /all - a short justification for obsoleting RFC6824 5. Chairs /all - List of implementations of the protocol & bis (ie a c= heck of which parts are implemented once or also in iOS) Our proposed plan is that once the various parts of #1 are done, we'll do a= WGLC. Items 3, 4 & 5 are things that will be useful to the IESG. Item 2 is= certainly something that would be nice to have - if there'll be a signific= ant delay implementing it, then we should discuss whether to wait, or wheth= er it's acceptable to progress without an implementation of this part. Finally a reminder that the plan is that RFC6824bis advances on the Standar= ds track From: Eardley,PL,Philip,TUD1 R Sent: 26 July 2017 08:51 To: multipathtcp > Subject: Changes to RFC6824bis Hi, During the discussions in Prague, we had good agreement about the following= change to the bis. This is a change to the wire protocol. Please say as so= on as possible if you disagree with this change, otherwise we'll go ahead a= nd make this change:- Remove address identifier from MP-PRIO, as it can be used as an attack. Explanation at https://mailarchive.ietf.org/arch/msg/multipathtcp/WWWaQ3AKW= EMgsBSPKc_R9Ct_YoI and follow up emails. The issue was briefly summarised d= uring the Friday meeting in Prague - eg see the etherpad for a summary http= ://etherpad.tools.ietf.org:9000/p/notes-ietf-99-mptcp?useMonospaceFont=3Dtr= ue Alan - are you ok to make this change please? -- In addition, we agreed in principle to the following (informational) change= s to the bis - exact text to be proposed. 2. Guidance about MPTCP & TFP interactions, based on https://www.ietf= .org/proceedings/99/slides/slides-99-mptcp-sessb-mptcp-tfo-00.pdf - Christo= ph & Olivier, please propose text. 3. There was a suggestion, arising from the hackathon, to discuss on = the list whether clarifications or extra 'reason codes' would be useful in = the context of reset option. Quentin (& others), please make a proposal. Best wishes, Phil & Yoshi --_000_162e9b4c97b44700affb0b1096cdea7erew09926dag03bdomain1sy_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

<< Implementers – implement SHA-256. As I understand i= t, this is the only part of the bis for which we don’t have at least = one implementation. Is there any timescale for implementing this?>>

I was wondering if there= was an update or plans about this. Alternatively, we may decide it’s ok to go ahead with last call without an implemen= tation for this aspect.

Thanks=

phil

From: = Eardley,PL,Philip,TUD1 R
Sent: 26 July 2017 15:46
To: Eardley,PL,Philip,TUD1 R <philip.eardley@bt.com>
Subject: Finishing RFC6824bis

 

We are close to finalising the bis and being able to WG Last call = and send it to the IESG. Here’s a list of actions. If we’ve for= gotten anything, or anyone has another mod /addition to the bis, please say.

1.      Make the changes agreed – see email below.

2.      Implementers – implement SH= A-256. As I understand it, this is the only part of the bis for which we do= n’t have at least one implementation. Is there any timescale for impl= ementing this?

3.      Chairs /all – list of chang= es between RFC & bis, along with a short justification

4.      Chairs /all – a short justi= fication for obsoleting RFC6824

5.      Chairs /all - List of implementat= ions of the protocol & bis (ie a check of which parts are implemented o= nce or also in iOS)

Our proposed plan is that once the various parts of #1 are done, w= e’ll do a WGLC. Items 3, 4 & 5 are things that will be useful to = the IESG. Item 2 is certainly something that would be nice to have – if there’ll be a significant delay implement= ing it, then we should discuss whether to wait, or whether it’s accep= table to progress without an implementation of this part.

Finally a reminder that the plan is that RFC6824bis advances on th= e Standards track

 

 = ;

From: = Eardley,PL,Philip,TUD1 R
Sent: 26 July 2017 08:51
To: multipathtcp <multip= athtcp@ietf.org>
Subject: Changes to RFC6824bis

 

Hi,

During the discussions in Prague, we had good agreement about the = following change to the bis. This is a change to the wire protocol. Please = say as soon as possible if you disagree with this change, otherwise we’ll go ahead and make this change:-

Remove= address identifier from MP-PRIO, as it can be used as an attack.

Explan= ation at https://mailarchive.ietf.org/arch/msg/multipathtcp/WWWaQ3AKWEMgsBSPKc_R9Ct_= YoI and follow up emails. The issue was briefly summarised during the F= riday meeting in Prague – eg see the etherpad for a summary http://etherpad.tools.ietf.org:9000/p/notes-ietf-99-mptcp?useMonospaceFont= =3Dtrue

Alan &= #8211; are you ok to make this change please?

--

In add= ition, we agreed in principle to the following (informational) changes to t= he bis – exact text to be proposed.

2.    &nbs= p;  Guidance about MPTCP & TFP interactio= ns, based on https://www.ietf.org/proceedings/99/slides/slides-99-mptcp-sessb-mptcp-tfo-= 00.pdf - Christoph & Olivier, please propose text.

3.    &nbs= p;  There was a suggestion, arising from the hackathon= , to discuss on the list whether clarifications or extra ‘reason code= s’ would be useful in the context of reset option. Quentin (& oth= ers), please make a proposal.

Best wishes,

Phil & Yoshi

 

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multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1E13F13A9F5 for ; Thu, 26 Oct 2017 01:20:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qFZ_88yNKlVE for ; Thu, 26 Oct 2017 01:20:41 -0700 (PDT) Received: from mailS.toulouse.viveris.com (mail.toulouse.viveris.com [212.99.125.10]) by ietfa.amsl.com (Postfix) with ESMTP id DE77613A25A for ; Thu, 26 Oct 2017 01:20:16 -0700 (PDT) Received: from hp (unknown [172.20.5.75]) by mailS.toulouse.viveris.com (Postfix) with ESMTPA id 6BEE1AC0095; Thu, 26 Oct 2017 10:20:01 +0200 (CEST) From: David Pradas To: multipathtcp@ietf.org Cc: Kuhn Nicolas , fabrice.arnal@thalesaleniaspace.com, SALLANTIN Renaud , Emmanuel Dubois , FASSON Julien , Riadh Dhaou , Joaquin Muguerza Message-ID: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> Date: Thu, 26 Oct 2017 10:19:59 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="------------ACF2508570F481F58EE2940E" Content-Language: en-GB Archived-At: X-Mailman-Approved-At: Thu, 26 Oct 2017 01:45:25 -0700 Subject: [multipathtcp] MPTCP transparent proxy X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Oct 2017 08:32:50 -0000 This is a multi-part message in MIME format. --------------ACF2508570F481F58EE2940E Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Dear All, We contact you regarding the MPTCP implementation (v0.92) and some problems we have encountered in a specific use case (transparent sockets). We will try to summarise the context of our study, as well as the problem and the solutions we propose to solve it. The objective of the study has been to work on a MPTCP-PEP proxy, where the proxy (PEPsalimplementation) splits the TCP connection and, with MPTCP, aggregates two link (satellite and terrestrial). We have also focused on other scenarios (e.g. PEPsal only on the satellite link), but we prefer to discuss only the one presented in the figure below: While trying to put together our implementation of PEPsal (transparent proxy) in a MPTCPcompliant kernel, we had to face a problem with the MPTCP implementation due to the transparent socketsusedin PEPsal. After carefully reading the MPTCP code, we discovered that when opening new subflows (using the fullmesh algorithm), first it is checked if the IP address of the main subflow corresponds to any of the network interfaces on the machine. This presents a problem when working with transparent sockets, since these sockets can be bound to external IP addresses, not present on the machine. In this case, the MPTCP implementation falls back to a classical TCP connection, which is not the behaviour wetarget. We assume such behaviour of  MPTCP implementation was a deliberate choice (e.g. for security concerns). Is it actually the main driver ? Could such compatibility with transparent proxying be acceptable for subsequent MPTCP versions ? We have proceeded to such code modification, and we are happy to share it with you, for review and possible integration in the main MPTCP code. You may decide for instance if this feature shall be implemented under all circumstances, or restricted to a certain mode only (e.g. activated through a control option, sysctl command, ... ). Secondly,we have carried out some performances tests with applications such as HTTP (measuring the page load time) or file transfer over TCP, and we have observed that MPTCP outperforms (or equals) the case where only one access is used (terrestrial or satellite), specially under congestion conditions. That being said, we expect to further work on this issue, mainly assessing (1) the performance of MPTCP schedulers with such large asymmetry, (2) the performance of the different coupled congestion control in our use-case and (3) consider the relevance of the second sub-flow opening (mainly for short flows). Do not hesitate to let us know if you have any interest in collaborating in this future work. We attached herein the modification we used, which allows MPTCP to work when using transparent sockets. We would be glad to discuss with you about this subject. Best Regards, David PRADAS Joaquin MUGUERZA --------------------//_ _// diff --git a/net/mptcp/mptcp_fullmesh.c b/net/mptcp/mptcp_fullmesh.c index 1e5b753..665560a 100644 --- a/net/mptcp/mptcp_fullmesh.c +++ b/net/mptcp/mptcp_fullmesh.c @@ -629,6 +629,38 @@ static void update_addr_bitfields(struct sock *meta_sk,         }  } +static int mptcp_find_address_transp(const struct mptcp_loc_addr *mptcp_local, +                             sa_family_t family, const union inet_addr *addr, +                             int if_idx) +{ +       int i; +       u8 loc_bits; +       bool found = false; + +       if (family == AF_INET) +               loc_bits = mptcp_local->loc4_bits; +       else +               loc_bits = mptcp_local->loc6_bits; + +       mptcp_for_each_bit_set(loc_bits, i) { +               if (family == AF_INET && +                   (!if_idx || mptcp_local->locaddr4[i].if_idx == if_idx)) { +                       found = true; +                       break; +               } +               if (family == AF_INET6 && +                   (!if_idx || mptcp_local->locaddr6[i].if_idx == if_idx)) { +                       found = true; +                       break; +               } +       } + +       if (!found) +               return -1; + +       return i; +} +  static int mptcp_find_address(const struct mptcp_loc_addr *mptcp_local,                               sa_family_t family, const union inet_addr *addr,                               int if_idx) @@ -1271,9 +1303,18 @@ static void full_mesh_new_session(const struct sock *meta_sk)         rcu_read_lock();         mptcp_local = rcu_dereference(fm_ns->local); -       index = mptcp_find_address(mptcp_local, family, &saddr, if_idx); -       if (index < 0) +       if(inet_sk(meta_sk)->transparent) { +               mptcp_debug("Meta socket is transparent"); +               index = mptcp_find_address_transp(mptcp_local, family, &saddr, if_idx); +       } +       else { +               mptcp_debug("Meta socket is NOT transparent"); +               index = mptcp_find_address(mptcp_local, family, &saddr, if_idx); +       } +       if (index < 0) { +               mptcp_debug("Falling back");                 goto fallback; +       }         if (family == AF_INET)                 master_tp->mptcp->low_prio = mptcp_local->locaddr4[index].low_prio; --------------------// //////// --------------ACF2508570F481F58EE2940E Content-Type: multipart/related; boundary="------------C21E9FE054BC92F47EA83BFB" --------------C21E9FE054BC92F47EA83BFB Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit

Dear All,

We contact you regarding the MPTCP implementation (v0.92) and some problems we have encountered in a specific use case (transparent sockets). We will try to summarise the context of our study, as well as the problem and the solutions we propose to solve it.

The objective of the study has been to work on a MPTCP-PEP proxy, where the proxy (PEPsal implementation) splits the TCP connection and, with MPTCP, aggregates two link (satellite and terrestrial). We have also focused on other scenarios (e.g. PEPsal only on the satellite link), but we prefer to discuss only the one presented in the figure below:

 

While trying to put together our implementation of PEPsal (transparent proxy) in a MPTCP compliant kernel, we had to face a problem with the MPTCP implementation due to the transparent sockets used in PEPsal. After carefully reading the MPTCP code, we discovered that when opening new subflows (using the fullmesh algorithm), first it is checked if the IP address of the main subflow corresponds to any of the network interfaces on the machine. This presents a problem when working with transparent sockets, since these sockets can be bound to external IP addresses, not present on the machine. In this case, the MPTCP implementation falls back to a classical TCP connection, which is not the behaviour we target.

We assume such behaviour of  MPTCP implementation was a deliberate choice (e.g. for security concerns). Is it actually the main driver ? Could such compatibility with transparent proxying be acceptable for subsequent MPTCP versions ?
We have proceeded to such code modification, and we are happy to share it with you, for review and possible integration in the main MPTCP code. You may decide for instance if this feature shall be implemented under all circumstances, or restricted to a certain mode only (e.g. activated through a control option, sysctl command, ... ).

Secondly, we have carried out some performances tests with applications such as HTTP (measuring the page load time) or file transfer over TCP, and we have observed that MPTCP outperforms (or equals) the case where only one access is used (terrestrial or satellite), specially under congestion conditions. That being said, we expect to further work on this issue, mainly assessing (1) the performance of MPTCP schedulers with such large asymmetry, (2) the performance of the different coupled congestion control in our use-case and (3) consider the relevance of the second sub-flow opening (mainly for short flows). Do not hesitate to let us know if you have any interest in collaborating in this future work.

We attached herein the modification we used, which allows MPTCP to work when using transparent sockets.

We would be glad to discuss with you about this subject.

Best Regards,

David PRADAS
Joaquin MUGUERZA


--------------------


diff --git a/net/mptcp/mptcp_fullmesh.c b/net/mptcp/mptcp_fullmesh.c
index 1e5b753..665560a 100644
--- a/net/mptcp/mptcp_fullmesh.c
+++ b/net/mptcp/mptcp_fullmesh.c
@@ -629,6 +629,38 @@ static void update_addr_bitfields(struct sock *meta_sk,
        }
 }

+static int mptcp_find_address_transp(const struct mptcp_loc_addr *mptcp_local,
+                             sa_family_t family, const union inet_addr *addr,
+                             int if_idx)
+{
+       int i;
+       u8 loc_bits;
+       bool found = false;
+
+       if (family == AF_INET)
+               loc_bits = mptcp_local->loc4_bits;
+       else
+               loc_bits = mptcp_local->loc6_bits;
+
+       mptcp_for_each_bit_set(loc_bits, i) {
+               if (family == AF_INET &&
+                   (!if_idx || mptcp_local->locaddr4[i].if_idx == if_idx)) {
+                       found = true;
+                       break;
+               }
+               if (family == AF_INET6 &&
+                   (!if_idx || mptcp_local->locaddr6[i].if_idx == if_idx)) {
+                       found = true;
+                       break;
+               }
+       }
+
+       if (!found)
+               return -1;
+
+       return i;
+}
+
 static int mptcp_find_address(const struct mptcp_loc_addr *mptcp_local,
                              sa_family_t family, const union inet_addr *addr,
                              int if_idx)
@@ -1271,9 +1303,18 @@ static void full_mesh_new_session(const struct sock *meta_sk)
        rcu_read_lock();
        mptcp_local = rcu_dereference(fm_ns->local);

-       index = mptcp_find_address(mptcp_local, family, &saddr, if_idx);
-       if (index < 0)
+       if(inet_sk(meta_sk)->transparent) {
+               mptcp_debug("Meta socket is transparent");
+               index = mptcp_find_address_transp(mptcp_local, family, &saddr, if_idx);
+       }
+       else {
+               mptcp_debug("Meta socket is NOT transparent");
+               index = mptcp_find_address(mptcp_local, family, &saddr, if_idx);
+       }
+       if (index < 0) {
+               mptcp_debug("Falling back");
                goto fallback;
+       }

        if (family == AF_INET)
                master_tp->mptcp->low_prio = mptcp_local->locaddr4[index].low_prio;

 

--------------------
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mail-in5.apple.com (Apple Secure Mail Relay) with SMTP id 90.D9.29765.94922F95; Thu, 26 Oct 2017 11:28:25 -0700 (PDT) X-AuditID: 11973e13-6fe289c000007445-8a-59f229497d16 Received: from nwk-mmpp-sz09.apple.com (nwk-mmpp-sz09.apple.com [17.128.115.80]) by relay6.apple.com (Apple SCV relay) with SMTP id F6.F9.12883.94922F95; Thu, 26 Oct 2017 11:28:25 -0700 (PDT) MIME-version: 1.0 Content-transfer-encoding: 8BIT Content-disposition: inline Content-type: text/plain; charset=iso-8859-1 Received: from localhost ([17.226.23.227]) by nwk-mmpp-sz09.apple.com (Oracle Communications Messaging Server 8.0.1.3.20170825 64bit (built Aug 25 2017)) with ESMTPSA id <0OYG006DL0ND3160@nwk-mmpp-sz09.apple.com>; Thu, 26 Oct 2017 11:28:25 -0700 (PDT) Sender: cpaasch@apple.com Date: Thu, 26 Oct 2017 11:28:25 -0700 From: Christoph Paasch To: David Pradas Cc: Joaquin Muguerza , fabrice.arnal@thalesaleniaspace.com, Kuhn Nicolas , Emmanuel Dubois , SALLANTIN Renaud , Riadh Dhaou , FASSON Julien , mptcp-dev@listes.uclouvain.be Message-id: <20171026182825.GC13451@Chimay.local> References: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> In-reply-to: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> User-Agent: Mutt/1.8.3 (2017-05-23) X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprEIsWRmVeSWpSXmKPExsUi2FAYpeup+SnS4MU1HYuej1wWb5asYbZ4 sucSu8WzvtnMFhdPTGS1mH9vFqPF59XX2SxmXVjOanHhFafFjtff2B24PLre/WL1aJ+X7bFk yU8mj7lv77J7TJ3yhtHj1MlVrB7Pj35iCmCP4rJJSc3JLEst0rdL4MpY0L6TrWCbScX+289Z Gxi7tLsYOTkkBEwkrp7cxtjFyMUhJLCaSaL1aBc7TGL+3NesEImDjBL/Nr0HS/AKCEr8mHyP pYuRg4NZQF7iyKVskDCzgLTEo78z2CFsHYne79+YIXobmSQmXTvNCpIQFpCU6L5zhxnEZhFQ lTjYvJcRxGYT0JJ4e7sdrEYEaHHT9xksIM3MAveZJPZeeM4G0WwisX76BVaIIwwlpm/fygRi Cwm4S7xu2MwCYnMKeEgcOrsa7ApRAWWJeftWsYEMkhD4zibx+spitgmMIrOQPDEL4YlZSJ6Y heSJBYwsqxiFchMzc3Qz80z1EgsKclL1kvNzNzGCInG6nfAOxtOrrA4xCnAwKvHwfvj4IVKI NbGsuDL3EKM0B4uSOO+v3x8jhQTSE0tSs1NTC1KL4otKc1KLDzEycXBKNTBqP9zj2vqsNpCl 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Tua7R0Zxj3neb/1qupxfX20ff65rvPOzxYHOFhVRiQq8PyUPqlqfWi1yfq7Ma4WtM468OayQ rDLF/BfXxDWlSizFGYmGWsxFxYkA6E9RvJgCAAA= Archived-At: X-Mailman-Approved-At: Thu, 26 Oct 2017 12:38:29 -0700 Subject: Re: [multipathtcp] MPTCP transparent proxy X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Oct 2017 18:28:28 -0000 + mptcp-dev And moving MPTCP IETF-mailing-list to BCC Hello, On 26/10/17 - 10:19:59, David Pradas wrote: > Dear All, > > We contact you regarding the MPTCP implementation (v0.92) and some problems > we have encountered in a specific use case (transparent sockets). We will > try to summarise the context of our study, as well as the problem and the > solutions we propose to solve it. > > The objective of the study has been to work on a MPTCP-PEP proxy, where the > proxy (PEPsalimplementation) splits the TCP connection and, with MPTCP, > aggregates two link (satellite and terrestrial). We have also focused on > other scenarios (e.g. PEPsal only on the satellite link), but we prefer to > discuss only the one presented in the figure below: > > While trying to put together our implementation of PEPsal (transparent > proxy) in a MPTCPcompliant kernel, we had to face a problem with the MPTCP > implementation due to the transparent socketsusedin PEPsal. After carefully > reading the MPTCP code, we discovered that when opening new subflows (using > the fullmesh algorithm), first it is checked if the IP address of the main > subflow corresponds to any of the network interfaces on the machine. This > presents a problem when working with transparent sockets, since these > sockets can be bound to external IP addresses, not present on the machine. > In this case, the MPTCP implementation falls back to a classical TCP > connection, which is not the behaviour wetarget. thanks for your detailed explanation. These transparent sockets are they on the passive opener-side (meaning in your picture on the right side) ? > We assume such behaviour of  MPTCP implementation was a deliberate choice > (e.g. for security concerns). Is it actually the main driver ? Could such > compatibility with transparent proxying be acceptable for subsequent MPTCP > versions ? No, it was not a deliberate choice. We didn't consider the case of transparent sockets. So, we definitely should fix this. But, I'm not sure whether your patch takes care of all the potential issues. It is looking for an index in the table and matches solely on the if_idx. Which, will be 0 if the socket is not using SO_BINDTODEV. That means, mptcp_find_address_transp will match on any address. The address it matches on will be removed from the set of eligible addresses that are being advertised through ADD_ADDR. Instead of taking the if_idx from SO_BINDTODEV, in the transparent case we probably should take the if_idx form the incoming interface. You have any thoughts on that? Christoph > We have proceeded to such code modification, and we are happy to share it > with you, for review and possible integration in the main MPTCP code. You > may decide for instance if this feature shall be implemented under all > circumstances, or restricted to a certain mode only (e.g. activated through > a control option, sysctl command, ... ). > > Secondly,we have carried out some performances tests with applications such > as HTTP (measuring the page load time) or file transfer over TCP, and we > have observed that MPTCP outperforms (or equals) the case where only one > access is used (terrestrial or satellite), specially under congestion > conditions. That being said, we expect to further work on this issue, mainly > assessing (1) the performance of MPTCP schedulers with such large asymmetry, > (2) the performance of the different coupled congestion control in our > use-case and (3) consider the relevance of the second sub-flow opening > (mainly for short flows). Do not hesitate to let us know if you have any > interest in collaborating in this future work. > > We attached herein the modification we used, which allows MPTCP to work when > using transparent sockets. > > We would be glad to discuss with you about this subject. > > Best Regards, > > David PRADAS > Joaquin MUGUERZA > > > --------------------//_ > > _// > diff --git a/net/mptcp/mptcp_fullmesh.c b/net/mptcp/mptcp_fullmesh.c > index 1e5b753..665560a 100644 > --- a/net/mptcp/mptcp_fullmesh.c > +++ b/net/mptcp/mptcp_fullmesh.c > @@ -629,6 +629,38 @@ static void update_addr_bitfields(struct sock *meta_sk, >         } >  } > > +static int mptcp_find_address_transp(const struct mptcp_loc_addr > *mptcp_local, > +                             sa_family_t family, const union inet_addr > *addr, > +                             int if_idx) > +{ > +       int i; > +       u8 loc_bits; > +       bool found = false; > + > +       if (family == AF_INET) > +               loc_bits = mptcp_local->loc4_bits; > +       else > +               loc_bits = mptcp_local->loc6_bits; > + > +       mptcp_for_each_bit_set(loc_bits, i) { > +               if (family == AF_INET && > +                   (!if_idx || mptcp_local->locaddr4[i].if_idx == if_idx)) > { > +                       found = true; > +                       break; > +               } > +               if (family == AF_INET6 && > +                   (!if_idx || mptcp_local->locaddr6[i].if_idx == if_idx)) > { > +                       found = true; > +                       break; > +               } > +       } > + > +       if (!found) > +               return -1; > + > +       return i; > +} > + >  static int mptcp_find_address(const struct mptcp_loc_addr *mptcp_local, >                               sa_family_t family, const union inet_addr > *addr, >                               int if_idx) > @@ -1271,9 +1303,18 @@ static void full_mesh_new_session(const struct sock > *meta_sk) >         rcu_read_lock(); >         mptcp_local = rcu_dereference(fm_ns->local); > > -       index = mptcp_find_address(mptcp_local, family, &saddr, if_idx); > -       if (index < 0) > +       if(inet_sk(meta_sk)->transparent) { > +               mptcp_debug("Meta socket is transparent"); > +               index = mptcp_find_address_transp(mptcp_local, family, > &saddr, if_idx); > +       } > +       else { > +               mptcp_debug("Meta socket is NOT transparent"); > +               index = mptcp_find_address(mptcp_local, family, &saddr, > if_idx); > +       } > +       if (index < 0) { > +               mptcp_debug("Falling back"); >                 goto fallback; > +       } > >         if (family == AF_INET) >                 master_tp->mptcp->low_prio = > mptcp_local->locaddr4[index].low_prio; > > --------------------// > //////// > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp From nobody Fri Oct 27 05:01:07 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1209013F501 for ; Fri, 27 Oct 2017 05:01:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.608 X-Spam-Level: X-Spam-Status: No, score=-2.608 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id u5xFhTeagYJP for ; Fri, 27 Oct 2017 05:00:58 -0700 (PDT) Received: from orange.com (mta136.mail.business.static.orange.com [80.12.70.36]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client 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AQHTTwTAAlb5VZkfI0GV39ScorDdVaL3lJjw Date: Fri, 27 Oct 2017 12:00:55 +0000 Message-ID: <787AE7BB302AE849A7480A190F8B93300A05F493@OPEXCLILMA3.corporate.adroot.infra.ftgroup> References: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> <787AE7BB302AE849A7480A190F8B93300A05E6E2@OPEXCLILMA3.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [10.168.234.6] Content-Type: multipart/related; boundary="_004_787AE7BB302AE849A7480A190F8B93300A05F493OPEXCLILMA3corp_"; type="multipart/alternative" MIME-Version: 1.0 Archived-At: Subject: Re: [multipathtcp] MPTCP transparent proxy X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Oct 2017 12:01:06 -0000 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Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1F6DA13A902 for ; Fri, 27 Oct 2017 02:20:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.889 X-Spam-Level: X-Spam-Status: No, score=-1.889 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, T_KAM_HTML_FONT_INVALID=0.01] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xacBVmfz0RUr for ; Fri, 27 Oct 2017 02:19:57 -0700 (PDT) Received: from mailS.toulouse.viveris.com (mail.toulouse.viveris.com [212.99.125.10]) by ietfa.amsl.com (Postfix) with ESMTP id 363CF13A5CF for ; Fri, 27 Oct 2017 02:19:54 -0700 (PDT) Received: from hp (unknown [172.20.5.75]) by mailS.toulouse.viveris.com (Postfix) with ESMTPA id E3669AC00B6; Fri, 27 Oct 2017 11:19:50 +0200 (CEST) To: mohamed.boucadair@orange.com, "multipathtcp@ietf.org" Cc: Joaquin Muguerza , "fabrice.arnal@thalesaleniaspace.com" , Kuhn Nicolas , Emmanuel Dubois , SALLANTIN Renaud , Riadh Dhaou , FASSON Julien References: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> <787AE7BB302AE849A7480A190F8B93300A05E6E2@OPEXCLILMA3.corporate.adroot.infra.ftgroup> From: David Pradas Message-ID: Date: Fri, 27 Oct 2017 11:19:49 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A05E6E2@OPEXCLILMA3.corporate.adroot.infra.ftgroup> Content-Type: multipart/alternative; boundary="------------04D8E6D634B88502F038CC52" Content-Language: en-GB Archived-At: X-Mailman-Approved-At: Fri, 27 Oct 2017 07:56:32 -0700 Subject: Re: [multipathtcp] MPTCP transparent proxy X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Oct 2017 09:20:01 -0000 This is a multi-part message in MIME format. --------------04D8E6D634B88502F038CC52 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hi Med, Thank you for your reply. Yes, indeed, we also sent the email to the maintainers of the MPTCP implementation for further discussion regarding the modification. But we wanted to share the context of the study with the IETF mailing list since we thought it would be interesting to have your feedback. Regarding your questions: - Is there any reason why you decided to use the transparent proxy mode? Your question is very relevant! It was a functional requirement, we wanted to evaluated the system performance without NAT translation. - Did you considered to use the explicit mode? We did not consider this mode, because we though that, even giving the address list, the behaviour of the implementation will be the same: i.e. fallback to TCP if the address is not present in the machine (to be confirmed!). - How do you ensure that the proxy will be on-path whatever the link you use to place the first subflow? In fact, we always force the fist subflow to go through the terrestrial link (and the second one through the satellite link). Knowing that both link are aggregated by our proxy MPTCP-PEP. Kind regards, David Le 26/10/2017 à 10:59, mohamed.boucadair@orange.com a écrit : > > Dear David, all, > > Thank you for sharing this information. You may want to direct this > message to the maintainers of the MPTCP implementation you mentioned. > > I have some architectural questions: Is there any reason why you > decided to use the transparent proxy mode? Did you considered to use > the explicit mode? How do you ensure that the proxy will be on-path > whatever the link you use to place the first subflow? > > Thank you. > > Cheers, > > Med > > *De :*multipathtcp [mailto:multipathtcp-bounces@ietf.org] *De la part > de* David Pradas > *Envoyé :* jeudi 26 octobre 2017 10:20 > *À :* multipathtcp@ietf.org > *Cc :* Joaquin Muguerza; fabrice.arnal@thalesaleniaspace.com; Kuhn > Nicolas; Emmanuel Dubois; SALLANTIN Renaud; Riadh Dhaou; FASSON Julien > *Objet :* [multipathtcp] MPTCP transparent proxy > > Dear All, > > We contact you regarding the MPTCP implementation (v0.92) and some > problems we have encountered in a specific use case (transparent > sockets). We will try to summarise the context of our study, as well > as the problem and the solutions we propose to solve it. > > The objective of the study has been to work on a MPTCP-PEP proxy, > where the proxy (PEPsal implementation) splits the TCP connection and, > with MPTCP, aggregates two link (satellite and terrestrial). We have > also focused on other scenarios (e.g. PEPsal only on the satellite > link), but we prefer to discuss only the one presented in the figure > below: > > While trying to put together our implementation of PEPsal (transparent > proxy) in a MPTCPcompliant kernel, we had to face a problem with the > MPTCP implementation due to the transparent socketsusedin PEPsal. > After carefully reading the MPTCP code, we discovered that when > opening new subflows (using the fullmesh algorithm), first it is > checked if the IP address of the main subflow corresponds to any of > the network interfaces on the machine. This presents a problem when > working with transparent sockets, since these sockets can be bound to > external IP addresses, not present on the machine. In this case, the > MPTCP implementation falls back to a classical TCP connection, which > is not the behaviour wetarget. > > We assume such behaviour of  MPTCP implementation was a deliberate > choice (e.g. for security concerns). Is it actually the main driver ? > Could such compatibility with transparent proxying be acceptable for > subsequent MPTCP versions ? > We have proceeded to such code modification, and we are happy to share > it with you, for review and possible integration in the main MPTCP > code. You may decide for instance if this feature shall be implemented > under all circumstances, or restricted to a certain mode only (e.g. > activated through a control option, sysctl command, ... ). > > Secondly,we have carried out some performances tests with applications > such as HTTP (measuring the page load time) or file transfer over TCP, > and we have observed that MPTCP outperforms (or equals) the case where > only one access is used (terrestrial or satellite), specially under > congestion conditions. That being said, we expect to further work on > this issue, mainly assessing (1) the performance of MPTCP schedulers > with such large asymmetry, (2) the performance of the different > coupled congestion control in our use-case and (3) consider the > relevance of the second sub-flow opening (mainly for short flows). Do > not hesitate to let us know if you have any interest in collaborating > in this future work. > > We attached herein the modification we used, which allows MPTCP to > work when using transparent sockets. > > We would be glad to discuss with you about this subject. > > Best Regards, > > David PRADAS > Joaquin MUGUERZA > > > --------------------/_ > > _/ > diff --git a/net/mptcp/mptcp_fullmesh.c b/net/mptcp/mptcp_fullmesh.c > index 1e5b753..665560a 100644 > --- a/net/mptcp/mptcp_fullmesh.c > +++ b/net/mptcp/mptcp_fullmesh.c > @@ -629,6 +629,38 @@ static void update_addr_bitfields(struct sock > *meta_sk, >         } >  } > > +static int mptcp_find_address_transp(const struct mptcp_loc_addr > *mptcp_local, > +                             sa_family_t family, const union > inet_addr *addr, > +                             int if_idx) > +{ > +       int i; > +       u8 loc_bits; > +       bool found = false; > + > +       if (family == AF_INET) > +               loc_bits = mptcp_local->loc4_bits; > +       else > +               loc_bits = mptcp_local->loc6_bits; > + > +       mptcp_for_each_bit_set(loc_bits, i) { > +               if (family == AF_INET && > +                   (!if_idx || mptcp_local->locaddr4[i].if_idx == > if_idx)) { > +                       found = true; > +                       break; > +               } > +               if (family == AF_INET6 && > +                   (!if_idx || mptcp_local->locaddr6[i].if_idx == > if_idx)) { > +                       found = true; > +                       break; > +               } > +       } > + > +       if (!found) > +               return -1; > + > +       return i; > +} > + >  static int mptcp_find_address(const struct mptcp_loc_addr *mptcp_local, >                               sa_family_t family, const union > inet_addr *addr, >                               int if_idx) > @@ -1271,9 +1303,18 @@ static void full_mesh_new_session(const struct > sock *meta_sk) >         rcu_read_lock(); >         mptcp_local = rcu_dereference(fm_ns->local); > > -       index = mptcp_find_address(mptcp_local, family, &saddr, if_idx); > -       if (index < 0) > +       if(inet_sk(meta_sk)->transparent) { > +               mptcp_debug("Meta socket is transparent"); > +               index = mptcp_find_address_transp(mptcp_local, family, > &saddr, if_idx); > +       } > +       else { > +               mptcp_debug("Meta socket is NOT transparent"); > +               index = mptcp_find_address(mptcp_local, family, > &saddr, if_idx); > +       } > +       if (index < 0) { > +               mptcp_debug("Falling back"); >                 goto fallback; > +       } > >         if (family == AF_INET) >                 master_tp->mptcp->low_prio = > mptcp_local->locaddr4[index].low_prio; > > --------------------// > -- *David PRADAS* Responsable Technique de Projets /(Ph.D. in Telecommunications)/ Viveris Technologies +33(0)561003088 _david.pradas@toulouse.viveris.com_ ////// --------------04D8E6D634B88502F038CC52 Content-Type: multipart/related; boundary="------------3CECF06FC0CEF851A377AF16" --------------3CECF06FC0CEF851A377AF16 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
Hi Med,

Thank you for your reply. Yes, indeed, we also sent the email to the maintainers of the MPTCP implementation for further discussion regarding the modification. But we wanted to share the context of the study with the IETF mailing list since we thought it would be interesting to have your feedback.

Regarding your questions:
-  Is there any reason why you decided to use the transparent proxy mode?
Your question is very relevant! It was a functional requirement, we wanted to evaluated the system performance without NAT translation.

- Did you considered to use the explicit mode?
We did not consider this mode, because we though that, even giving the address list, the behaviour of the implementation will be the same: i.e. fallback to TCP if the address is not present in the machine (to be confirmed!).

- How do you ensure that the proxy will be on-path whatever the link you use to place the first subflow?
In fact, we always force the fist subflow to go through the terrestrial link (and the second one through the satellite link). Knowing that both link are aggregated by our proxy MPTCP-PEP.


Kind regards,

David


Le 26/10/2017 à 10:59, mohamed.boucadair@orange.com a écrit :

Dear David, all,

 

Thank you for sharing this information. You may want to direct this message to the maintainers of the MPTCP implementation you mentioned.

 

I have some architectural questions: Is there any reason why you decided to use the transparent proxy mode? Did you considered to use the explicit mode? How do you ensure that the proxy will be on-path whatever the link you use to place the first subflow?

 

Thank you.

 

Cheers,

Med

 

De : multipathtcp [mailto:multipathtcp-bounces@ietf.org] De la part de David Pradas
Envoyé : jeudi 26 octobre 2017 10:20
À : multipathtcp@ietf.org
Cc : Joaquin Muguerza; fabrice.arnal@thalesaleniaspace.com; Kuhn Nicolas; Emmanuel Dubois; SALLANTIN Renaud; Riadh Dhaou; FASSON Julien
Objet : [multipathtcp] MPTCP transparent proxy

 

Dear All,

We contact you regarding the MPTCP implementation (v0.92) and some problems we have encountered in a specific use case (transparent sockets). We will try to summarise the context of our study, as well as the problem and the solutions we propose to solve it.

The objective of the study has been to work on a MPTCP-PEP proxy, where the proxy (PEPsal implementation) splits the TCP connection and, with MPTCP, aggregates two link (satellite and terrestrial). We have also focused on other scenarios (e.g. PEPsal only on the satellite link), but we prefer to discuss only the one presented in the figure below:

 

While trying to put together our implementation of PEPsal (transparent proxy) in a MPTCP compliant kernel, we had to face a problem with the MPTCP implementation due to the transparent sockets used in PEPsal. After carefully reading the MPTCP code, we discovered that when opening new subflows (using the fullmesh algorithm), first it is checked if the IP address of the main subflow corresponds to any of the network interfaces on the machine. This presents a problem when working with transparent sockets, since these sockets can be bound to external IP addresses, not present on the machine. In this case, the MPTCP implementation falls back to a classical TCP connection, which is not the behaviour we target.

We assume such behaviour of  MPTCP implementation was a deliberate choice (e.g. for security concerns). Is it actually the main driver ? Could such compatibility with transparent proxying be acceptable for subsequent MPTCP versions ?
We have proceeded to such code modification, and we are happy to share it with you, for review and possible integration in the main MPTCP code. You may decide for instance if this feature shall be implemented under all circumstances, or restricted to a certain mode only (e.g. activated through a control option, sysctl command, ... ).

Secondly, we have carried out some performances tests with applications such as HTTP (measuring the page load time) or file transfer over TCP, and we have observed that MPTCP outperforms (or equals) the case where only one access is used (terrestrial or satellite), specially under congestion conditions. That being said, we expect to further work on this issue, mainly assessing (1) the performance of MPTCP schedulers with such large asymmetry, (2) the performance of the different coupled congestion control in our use-case and (3) consider the relevance of the second sub-flow opening (mainly for short flows). Do not hesitate to let us know if you have any interest in collaborating in this future work.

We attached herein the modification we used, which allows MPTCP to work when using transparent sockets.

We would be glad to discuss with you about this subject.

Best Regards,

David PRADAS
Joaquin MUGUERZA


--------------------


diff --git a/net/mptcp/mptcp_fullmesh.c b/net/mptcp/mptcp_fullmesh.c
index 1e5b753..665560a 100644
--- a/net/mptcp/mptcp_fullmesh.c
+++ b/net/mptcp/mptcp_fullmesh.c
@@ -629,6 +629,38 @@ static void update_addr_bitfields(struct sock *meta_sk,
        }
 }

+static int mptcp_find_address_transp(const struct mptcp_loc_addr *mptcp_local,
+                             sa_family_t family, const union inet_addr *addr,
+                             int if_idx)
+{
+       int i;
+       u8 loc_bits;
+       bool found = false;
+
+       if (family == AF_INET)
+               loc_bits = mptcp_local->loc4_bits;
+       else
+               loc_bits = mptcp_local->loc6_bits;
+
+       mptcp_for_each_bit_set(loc_bits, i) {
+               if (family == AF_INET &&
+                   (!if_idx || mptcp_local->locaddr4[i].if_idx == if_idx)) {
+                       found = true;
+                       break;
+               }
+               if (family == AF_INET6 &&
+                   (!if_idx || mptcp_local->locaddr6[i].if_idx == if_idx)) {
+                       found = true;
+                       break;
+               }
+       }
+
+       if (!found)
+               return -1;
+
+       return i;
+}
+
 static int mptcp_find_address(const struct mptcp_loc_addr *mptcp_local,
                              sa_family_t family, const union inet_addr *addr,
                              int if_idx)
@@ -1271,9 +1303,18 @@ static void full_mesh_new_session(const struct sock *meta_sk)
        rcu_read_lock();
        mptcp_local = rcu_dereference(fm_ns->local);

-       index = mptcp_find_address(mptcp_local, family, &saddr, if_idx);
-       if (index < 0)
+       if(inet_sk(meta_sk)->transparent) {
+               mptcp_debug("Meta socket is transparent");
+               index = mptcp_find_address_transp(mptcp_local, family, &saddr, if_idx);
+       }
+       else {
+               mptcp_debug("Meta socket is NOT transparent");
+               index = mptcp_find_address(mptcp_local, family, &saddr, if_idx);
+       }
+       if (index < 0) {
+               mptcp_debug("Falling back");
                goto fallback;
+       }

        if (family == AF_INET)
                master_tp->mptcp->low_prio = mptcp_local->locaddr4[index].low_prio;

 

--------------------


--
David PRADAS
Responsable Technique de Projets
(Ph.D. in Telecommunications)
Viveris Technologies
+33(0)561003088
david.pradas@toulouse.viveris.com
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RRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUUUAFFFFABRRRQAUUU UAFFFFABRRRQB//Z --------------3CECF06FC0CEF851A377AF16-- --------------04D8E6D634B88502F038CC52-- From nobody Sun Oct 29 18:27:16 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 08D9313F605 for ; Sun, 29 Oct 2017 18:27:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.399 X-Spam-Level: X-Spam-Status: No, score=-1.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_SORBS_SPAM=0.5, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id VId0Vyhzn1e5 for ; Sun, 29 Oct 2017 18:27:13 -0700 (PDT) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [203.178.142.130]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 59F7B13DC3B for ; Sun, 29 Oct 2017 18:27:13 -0700 (PDT) Received: from mail-wr0-f172.google.com (mail-wr0-f172.google.com [209.85.128.172]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id 31139278617 for ; Mon, 30 Oct 2017 10:27:11 +0900 (JST) Received: by mail-wr0-f172.google.com with SMTP id w105so11028031wrc.0 for ; Sun, 29 Oct 2017 18:27:11 -0700 (PDT) X-Gm-Message-State: AMCzsaXBvi32GzgurtF9ge0FrXKWCFAwpake0lWBc22xh0b+ed7DwGJ5 2uZPhgRiMHTsVZNi3zZQLVrmqs2O+CC5M/QDdbo= X-Google-Smtp-Source: ABhQp+TEoKAQAWLV60+6lWTsBIncqEYSAkhX7IlrX+fGW7xTf80yHgoe8wSN/7V6ywY8g9OE0ytaAV6r/rrlC9b/iCA= X-Received: by 10.223.184.205 with SMTP id c13mr5439554wrg.268.1509326829030; Sun, 29 Oct 2017 18:27:09 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.141.148 with HTTP; Sun, 29 Oct 2017 18:27:08 -0700 (PDT) In-Reply-To: References: <64f1b27aee214f6b99b5c474158d7426@HE105686.emea1.cds.t-internal.com> <79ac6cb307784db3a6d8ae1550a49573@HE105686.emea1.cds.t-internal.com> <272695de663e4adca1930203b32f44e7@HE105686.emea1.cds.t-internal.com> From: Yoshifumi Nishida Date: Sun, 29 Oct 2017 18:27:08 -0700 X-Gmail-Original-Message-ID: Message-ID: To: Markus.Amend@telekom.de Cc: Yoshifumi Nishida , multipathtcp Content-Type: multipart/alternative; boundary="f403045f508a7e9132055cb989de" Archived-At: Subject: Re: [multipathtcp] A proposal for MPTCP Robust session Establishment (MPTCP RobE) X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Oct 2017 01:27:16 -0000 --f403045f508a7e9132055cb989de Content-Type: text/plain; charset="UTF-8" Hi Markus, Thanks for the response. Some points became clearer to me. On Wed, Oct 25, 2017 at 5:08 AM, wrote: > Dear Yoshi, > > see inline > > > -----Original Message----- > > From: Yoshifumi Nishida [mailto:nishida@sfc.wide.ad.jp] > > Sent: Mittwoch, 4. Oktober 2017 09:53 > > To: Amend, Markus > > Cc: multipathtcp > > Subject: Re: [multipathtcp] A proposal for MPTCP Robust session > > Establishment (MPTCP RobE) > > > > Hi Markus, > > > > I still need to think about it a bit more, but here's my current > thoughts.. Sorry > > for slow response. > > > > 1: I am guessing we cannot use this approach with TFO yet. But, if TFO > cannot > > be used, it might affect the latency of some apps. > > > We assume, RobE can incorporate TFO. Therefore we have different solutions > in mind. But first we need an aligned understanding of TFO. There is one > aspect, which isn't fully clear for me or respectively from my view not > specified explicitly in RFC7413. > TFO allows payload in a SYN and in case of a valid TFO cookie, this is > directly delivered to receivers application. Now the question: Is the > sender allowed to proceed directly after sending the SYN with further data > packets or is a SYN/ACK response required? > By investigating current Linux TFO implementation it seems, sender first > wait for the SYN/ACK before sending further data packets. But what shall we > assume? At the end this is pretty important for a possible RobE<->TFO > integration. > Well, I'm not worry very much about whether the sender wait for SYN ACK before proceed. Please let me explain... When you use TFO, I guess you'll send the same payload P in two SYN segments. Then, both P payloads can be delivered to application sockets. In this case, I'm still now sure how we can combine two sockets (on both sender and receiver side) For example, should the sender presume that two P have been received by the receiver and advanced seq no by 2*P? When I think about these kinds of situations, I thought it might be complex. > > 3: I guess we'll need another step after SA6.2 to verify the response > from > > host B. > > no, we don't. data can be sent together with the MP_JOIN_CAP and > immediately afterwards. if it is not successful, either we receive a RST > (standard case) or we run into a timeout (error case). In both cases a > retransmit over the first path is done. > > > Also, MP_JOIN_CAP will require extra RTTs when the other end doesn't > > support it. (because it will need to send RST and MP_JOIN to establish a > > subflow) > > > yes, indeed this is a problem. there are several possibilities to address > that problem: > a) modify the MP_CAPABLE, adding an extra bit in syn/syn-ack. (e.g. one of > the A-H bits). > however this violates the standard, and thus will be incompatible with > existing implementations - unless it is introduced together with > ver. 1 - which already is incompatible, so it doesn't matter. > b) if introduced together with ver. 1 - we know that the server supports > it if it supports ver. 1 - however it still might be deactivated. > c) add an extra MPTCP-option. > in version 0, this can exhaust the tcp option space. > in version 1, (due to missing key info) this is feasible, if TFO > is not active. with TFO we already have that info, an extra option > is not necessary. > d) cache that information, so only the first try adds an extra rtt. > later on (until cache expiration) we don't try fast-join again. > e) sending an MP_JOIN_CAP + sending an MP_JOIN (note the join is a > new connection request (SYN), but can be associated with the > MP_JOIN_CAP by the key/token). > - In case the MP_JOIN_CAP succeeds, the MP_JOIN is ignored. > - In case it fails, the join is initiated before the RST arrives > on sender site. Avoiding the extra RTT, with the cost of > extra packets on the wire. > - The problem with reordering on the wire (MP_JOIN arrives before > MP_JOIN_CAP), can be avoided using one of the three reserved bits > in the MP_JOIN. These should be ignored by current implementations. > f) a combination of those above. > > > 4: I tend to prefer just sending MP_JOIN after SA6.1 for simplicity so > far. We > > might be able to do everything in a shim layer. > > > Of course it is possible to do it in two steps. First only robustness and > later on extend it with the fast-join approach. > But why a shim-layer, do you suspect some incompatibility issues? Or do > you just want to keep it out of MPTCP? > But then note: Even that shim-layer needs a path-management. Either MPTCP > has to provide a standard API to access the path-management from the > outside world. > There's no big reasons for a shim layer approach. I just thought we might be able to do most of the things without changing MPTCP, although I miss something. If doing it in kernel has some advantages, it may be a different story. I am not sure yet if the shim layer approach will require a path management. It looks to me just creating a subflow of the MPTCP session through an API. Thanks, -- Yoshi --f403045f508a7e9132055cb989de Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Markus,

Thanks for the response. Some points became clearer to = me.

On Wed, = Oct 25, 2017 at 5:08 AM, <Markus.Amend@telekom.de> wr= ote:
Dear Yoshi,

see inline

> -----Original Message-----
> From: Yoshifumi Nishida [mailto:nishida@sfc.wide.ad.jp]
> Sent: Mittwoch, 4. Oktober 2017 09:53
> To: Amend, Markus <Markus.Amend@telekom.de>
> Cc: multipathtcp <multipathtcp@ietf.org>
> Subject: Re: [multipathtcp] A proposal for MPTCP Robust session
> Establishment (MPTCP RobE)
>
> Hi Markus,
>
> I still need to think about it a bit more, but here's my current t= houghts.. Sorry
> for slow response.
>
> 1: I am guessing we cannot use this approach with TFO yet. But, if TFO= cannot
> be used, it might affect the latency of some apps.
>
We assume, RobE can incorporate TFO. Therefore we have different sol= utions in mind. But first we need an aligned understanding of TFO. There is= one aspect, which isn't fully clear for me or respectively from my vie= w not specified explicitly in RFC7413.
TFO allows payload in a SYN and in case of a valid TFO cookie, this is dire= ctly delivered to receivers application. Now the question:=C2=A0 Is the sen= der allowed to proceed directly after sending the SYN with further data pac= kets or is a SYN/ACK response required?
By investigating current Linux TFO implementation it seems, sender first wa= it for the SYN/ACK before sending further data packets. But what shall we a= ssume? At the end this is pretty important for a possible RobE<->TFO = integration.

Well, I'm not worry ve= ry much about whether the sender wait for SYN ACK before proceed.
Please let me explain...
When you use TFO, I guess you'l= l send the same payload P in two SYN segments. =C2=A0
Then, both = P payloads can be delivered to application sockets.
In this case,= I'm still now sure how we can combine two sockets (on both sender and = receiver side)
For example, should the sender presume that two P = have been received by the receiver and advanced seq no by 2*P?
Wh= en I think about these kinds of situations, I thought it might be complex.<= /div>
=C2=A0
> 3: I guess we'll need another step after SA6.2 to verify the respo= nse from
> host B.

no, we don't. data can be sent together with the MP_JOIN_CAP and= immediately afterwards. if it is not successful, either we receive a RST (= standard case) or we run into a timeout (error case). In both cases a retra= nsmit over the first path is done.

> =C2=A0 =C2=A0 Also, MP_JOIN_CAP will require extra RTTs when the other= end doesn't
> support it. (because it will need to send RST and MP_JOIN to establish= a
> subflow)
>
yes, indeed this is a problem. there are several possibilities to ad= dress that problem:
a) modify the MP_CAPABLE, adding an extra bit in syn/syn-ack. (e.g. one of<= br> =C2=A0 =C2=A0the A-H bits).
=C2=A0 =C2=A0however this violates the standard, and thus will be incompati= ble with
=C2=A0 =C2=A0existing implementations - unless it is introduced together wi= th
=C2=A0 =C2=A0ver. 1 - which already is incompatible, so it doesn't matt= er.
b) if introduced together with ver. 1 - we know that the server supports =C2=A0 =C2=A0it if it supports ver. 1 - however it still might be deactivat= ed.
c) add an extra MPTCP-option.
=C2=A0 =C2=A0in version 0, this can exhaust the tcp option space.
=C2=A0 =C2=A0in version 1, (due to missing key info) this is feasible, if T= FO
=C2=A0 =C2=A0is not active. with TFO we already have that info, an extra op= tion
=C2=A0 =C2=A0is not necessary.
d) cache that information, so only the first try adds an extra rtt.
=C2=A0 =C2=A0later on (until cache expiration) we don't try fast-join a= gain.
e) sending an MP_JOIN_CAP + sending an MP_JOIN (note the join is a
=C2=A0 =C2=A0new connection request (SYN), but can be associated with the =C2=A0 =C2=A0MP_JOIN_CAP by the key/token).
=C2=A0 =C2=A0- In case the MP_JOIN_CAP succeeds, the MP_JOIN is ignored. =C2=A0 =C2=A0- In case it fails, the join is initiated before the RST arriv= es
=C2=A0 =C2=A0 =C2=A0on sender site. Avoiding the extra RTT, with the cost o= f
=C2=A0 =C2=A0 =C2=A0extra packets on the wire.
=C2=A0 =C2=A0- The problem with reordering on the wire (MP_JOIN arrives bef= ore
=C2=A0 =C2=A0 =C2=A0MP_JOIN_CAP), can be avoided using one of the three res= erved bits
=C2=A0 =C2=A0 =C2=A0in the MP_JOIN. These should be ignored by current impl= ementations.
f) a combination of those above.

> 4: I tend to prefer just sending MP_JOIN after SA6.1 for simplicity so= far. We
> might be able to do everything in a shim layer.
>
Of course it is possible to do it in two steps. First only robustnes= s and later on extend it with the fast-join approach.
But why a shim-layer, do you suspect some incompatibility issues? Or do you= just want to keep it out of MPTCP?
But then note: Even that shim-layer needs a path-management. Either MPTCP h= as to provide a standard API to access the path-management from the outside= world.

There's no big reasons for = a shim layer approach.
I just thought we might be able to do most= of the things without changing MPTCP, although I miss something.
If doing it in kernel has some advantages, it may be a different story.
I am not sure yet if the shim layer approach will require a path ma= nagement.=C2=A0
It looks to me just creating a subflow of the MPT= CP session through an API.=C2=A0

Thanks,
--
Yoshi
--f403045f508a7e9132055cb989de-- From nobody Sun Oct 29 18:43:16 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 28FF513FD25 for ; Sun, 29 Oct 2017 18:43:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.5 X-Spam-Level: X-Spam-Status: No, score=0.5 tagged_above=-999 required=5 tests=[BAYES_20=-0.001, HTML_MESSAGE=0.001, RCVD_IN_SORBS_SPAM=0.5, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lYaIDKVVcNny for ; Sun, 29 Oct 2017 18:43:13 -0700 (PDT) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [IPv6:2001:200:0:8803::53]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5BED713FD2C for ; Sun, 29 Oct 2017 18:43:13 -0700 (PDT) Received: from mail-wm0-f47.google.com (mail-wm0-f47.google.com [74.125.82.47]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id 7AB9A278650 for ; Mon, 30 Oct 2017 10:43:09 +0900 (JST) Received: by mail-wm0-f47.google.com with SMTP id p75so12760661wmg.3 for ; Sun, 29 Oct 2017 18:43:09 -0700 (PDT) X-Gm-Message-State: AMCzsaXmg2K8jO8VNqkuMH0kiHFz0ReD4kKpKnrPqOVzU+ngKgf9SEQv UayBJ5sJLMMAMuMRpl83hMa1Qw+pVWOtXF+QeNg= X-Google-Smtp-Source: ABhQp+SvNov/cH1SRk+O1Oe7Ji3AtohuTw6YpQidqdVKFC0UOWZrx4psMaYXrfBMFWClADmeflizDcQLo5wENX7n39o= X-Received: by 10.28.84.78 with SMTP id p14mr2550271wmi.94.1509327787428; Sun, 29 Oct 2017 18:43:07 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.141.148 with HTTP; Sun, 29 Oct 2017 18:43:06 -0700 (PDT) In-Reply-To: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> References: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> From: Yoshifumi Nishida Date: Sun, 29 Oct 2017 18:43:06 -0700 X-Gmail-Original-Message-ID: Message-ID: To: David Pradas Cc: multipathtcp , Joaquin Muguerza , fabrice.arnal@thalesaleniaspace.com, Kuhn Nicolas , Emmanuel Dubois , SALLANTIN Renaud , Riadh Dhaou , FASSON Julien Content-Type: multipart/alternative; boundary="94eb2c1cd30a9e91b0055cb9c2be" Archived-At: Subject: Re: [multipathtcp] MPTCP transparent proxy X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Oct 2017 01:43:15 -0000 --94eb2c1cd30a9e91b0055cb9c2be Content-Type: text/plain; charset="UTF-8" Hi David, On Thu, Oct 26, 2017 at 1:19 AM, David Pradas wrote: > > Secondly, we have carried out some performances tests with applications > such as HTTP (measuring the page load time) or file transfer over TCP, and > we have observed that MPTCP outperforms (or equals) the case where only one > access is used (terrestrial or satellite), specially under congestion > conditions. That being said, we expect to further work on this issue, > mainly assessing (1) the performance of MPTCP schedulers with such large > asymmetry, (2) the performance of the different coupled congestion control > in our use-case and (3) consider the relevance of the second sub-flow > opening (mainly for short flows). Do not hesitate to let us know if you > have any interest in collaborating in this future work. > Sounds interesting. It would be great if you could share more info about your network configuration (e.g. RTT, bandwidth, loss rate, apps, etc) -- Yoshi --94eb2c1cd30a9e91b0055cb9c2be Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi David,

On Thu, Oct 26, 2017 at 1:19 AM, David Pradas <david.pradas@toulouse.viveris.com> wrote:<= blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px= #ccc solid;padding-left:1ex">

Secondly, = we have carried out some performances tests with applications such as HTTP (measuring the page load time) or file transfer over TCP, and we have observed that MPTCP outperforms (or equals) the case where only one access is used (terrestrial or satellite), specially under congestion conditions. That being said, we expect to further work on this issue, mainly assessing (1) the performance of MPTCP schedulers with such large asymmetry, (2) the performance of the different coupled congestion control in our use-case and (3) consider the relevance of the second sub-flow opening (mainly for short flows). Do not hesitate to let us know if you have any interest in collaborating in this future work.

=
Sounds interesting.
It would be great if you could share mor= e info about your network configuration (e.g. RTT, bandwidth, loss rate, ap= ps, etc)=C2=A0
--
Yoshi
=C2=A0
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I doubt we will be able to update the draft before the cutoff tomorrow. I will try to get to it as soon as possible. Christoph > Thanks > phil > From: Eardley,PL,Philip,TUD1 R > Sent: 05 September 2017 17:32 > To: Eardley,PL,Philip,TUD1 R ; multipathtcp@ietf.org > Subject: RE: Changes to RFC6824bis > > Just wanted to check where we are re these 3 changes. > #1 - thanks to Alan for making this change > #2 - Christoph, Olivier - any news? > #3 - Quentin - any news? > Thanks! > Phil > > From: multipathtcp [mailto:multipathtcp-bounces@ietf.org] On Behalf Of philip.eardley@bt.com > Sent: 26 July 2017 08:51 > To: multipathtcp@ietf.org > Subject: [multipathtcp] Changes to RFC6824bis > > Hi, > During the discussions in Prague, we had good agreement about the following change to the bis. This is a change to the wire protocol. Please say as soon as possible if you disagree with this change, otherwise we'll go ahead and make this change:- > > Remove address identifier from MP-PRIO, as it can be used as an attack. > > Explanation at https://mailarchive.ietf.org/arch/msg/multipathtcp/WWWaQ3AKWEMgsBSPKc_R9Ct_YoI and follow up emails. The issue was briefly summarised during the Friday meeting in Prague - eg see the etherpad for a summary http://etherpad.tools.ietf.org:9000/p/notes-ietf-99-mptcp?useMonospaceFont=true > > Alan - are you ok to make this change please? > > -- > > In addition, we agreed in principle to the following (informational) changes to the bis - exact text to be proposed. > > 2. Guidance about MPTCP & TFP interactions, based on https://www.ietf.org/proceedings/99/slides/slides-99-mptcp-sessb-mptcp-tfo-00.pdf - Christoph & Olivier, please propose text. > > 3. There was a suggestion, arising from the hackathon, to discuss on the list whether clarifications or extra 'reason codes' would be useful in the context of reset option. Quentin (& others), please make a proposal. > Best wishes, > Phil & Yoshi > > _______________________________________________ > multipathtcp mailing list > multipathtcp@ietf.org > https://www.ietf.org/mailman/listinfo/multipathtcp From nobody Sun Oct 29 22:52:44 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9F97813A5AF for ; Sun, 29 Oct 2017 22:52:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.399 X-Spam-Level: X-Spam-Status: No, score=-1.399 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_SORBS_SPAM=0.5, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id daicDMLjUFAC for ; Sun, 29 Oct 2017 22:52:40 -0700 (PDT) Received: from mail.sfc.wide.ad.jp (shonan.sfc.wide.ad.jp [IPv6:2001:200:0:8803::53]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C6FD613F5ED for ; Sun, 29 Oct 2017 22:52:39 -0700 (PDT) Received: from mail-wm0-f49.google.com (mail-wm0-f49.google.com [74.125.82.49]) by mail.sfc.wide.ad.jp (Postfix) with ESMTPSA id D9EC9278639 for ; Mon, 30 Oct 2017 14:52:36 +0900 (JST) Received: by mail-wm0-f49.google.com with SMTP id z3so13881398wme.5 for ; Sun, 29 Oct 2017 22:52:36 -0700 (PDT) X-Gm-Message-State: AMCzsaVTbWPzuDdHtL4tnnFi8t9CiyDiGCr9yHzi9kOfN/IjzceV+wgG IDx0dc8O9AC4UUuQbjIsNzqoB9plCy2kxXQGV/c= X-Google-Smtp-Source: ABhQp+RgCV0r+2eSK6GVQ1ecE5bzw5ixrkbBz/EeOAqKMP6x9bl9zZEP3VMzbyC1FY1jm8AvNT10l4KkxHrji592j/M= X-Received: by 10.28.105.76 with SMTP id e73mr2907103wmc.116.1509342754797; Sun, 29 Oct 2017 22:52:34 -0700 (PDT) MIME-Version: 1.0 Received: by 10.223.141.148 with HTTP; Sun, 29 Oct 2017 22:52:34 -0700 (PDT) In-Reply-To: <1504869731213.54234@bt.com> References: <150459947192.28674.7149204113748374138.idtracker@ietfa.amsl.com> <1504869731213.54234@bt.com> From: Yoshifumi Nishida Date: Sun, 29 Oct 2017 22:52:34 -0700 X-Gmail-Original-Message-ID: Message-ID: To: "philip.eardley" Cc: multipathtcp , Yoshifumi Nishida Content-Type: multipart/alternative; boundary="001a1147c4eabe7db0055cbd3e7b" Archived-At: Subject: Re: [multipathtcp] mptcp - New Meeting Session Request for IETF 100 X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Oct 2017 05:52:42 -0000 --001a1147c4eabe7db0055cbd3e7b Content-Type: text/plain; charset="UTF-8" Hello, Just in case.. If you are planning to present something at Singapore, please let Phil and me know. If you have questions, please feel free to contact us as well. -- Yoshi & Phil On Fri, Sep 8, 2017 at 4:22 AM, wrote: > We've requested 1 session of 2 hours in Singapore. > > Please could you let us know if you think you'll need presentation > /discussion time in the meeting - if we get a lot of requests, we'll ask > for a second timeslot. > > We added Banana to the conflicts list - if other adjustments are needed, > please let us know. > > thanks > Phil & Yoshi > ________________________________________ > From: IETF Meeting Session Request Tool > Sent: 05 September 2017 09:17 > To: session-request@ietf.org > Cc: multipathtcp@ietf.org; ietf@kuehlewind.net; Eardley,PL,Philip,TUD1 R; > mptcp-chairs@ietf.org > Subject: mptcp - New Meeting Session Request for IETF 100 > > A new meeting session request has just been submitted by Philip Eardley, a > Chair of the mptcp working group. > > > --------------------------------------------------------- > Working Group Name: Multipath TCP > Area Name: Transport Area > Session Requester: Philip Eardley > > Number of Sessions: 1 > Length of Session(s): 2 Hours > Number of Attendees: 60 > Conflicts to Avoid: > First Priority: ippm tcpinc tcpm tsvarea tsvwg tls banana > Second Priority: taps iccrg rtcweb manet > Third Priority: nfvrg quic maprg > > > People who must be present: > Yoshifumi Nishida > Philip Eardley > Mirja Kuehlewind > > Resources Requested: > > Special Requests: > please avoid any transport area BoFs > --------------------------------------------------------- > > --001a1147c4eabe7db0055cbd3e7b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hello,

Just in case.. If you are planni= ng to present something at Singapore, please let Phil and me know.
If you have questions, please feel free to contact us as well.
= --
Yoshi & Phil


=
On Fri, Sep 8, 2017 at 4:22 AM, <philip.ea= rdley@bt.com> wrote:
We'= ;ve requested 1 session of 2 hours in Singapore.

Please could you let us know if you think you'll need presentation /dis= cussion time in the meeting - if we get a lot of requests, we'll ask fo= r a second timeslot.

We added Banana to the conflicts list - if other adjustments are needed, pl= ease let us know.

thanks
Phil & Yoshi
________________________________________
From: IETF Meeting Session Request Tool <session-request@ietf.org>
Sent: 05 September 2017 09:17
To: session-request@ietf.org
Cc: multipathtcp@ietf.org; ietf@kuehlewind.net; Eardley,PL,Phi= lip,TUD1 R; mptcp-chairs@ietf.org<= /a>
Subject: mptcp - New Meeting Session Request for IETF 100

A new meeting session request has just been submitted by Philip Eardley, a = Chair of the mptcp working group.


---------------------------------------------------------
Working Group Name: Multipath TCP
Area Name: Transport Area
Session Requester: Philip Eardley

Number of Sessions: 1
Length of Session(s):=C2=A0 2 Hours
Number of Attendees: 60
Conflicts to Avoid:
=C2=A0First Priority: ippm tcpinc tcpm tsvarea tsvwg tls banana
=C2=A0Second Priority: taps iccrg rtcweb manet
=C2=A0Third Priority: nfvrg quic maprg


People who must be present:
=C2=A0 Yoshifumi Nishida
=C2=A0 Philip Eardley
=C2=A0 Mirja Kuehlewind

Resources Requested:

Special Requests:
=C2=A0 please avoid any transport area BoFs
---------------------------------------------------------


--001a1147c4eabe7db0055cbd3e7b-- From nobody Mon Oct 30 07:52:46 2017 Return-Path: X-Original-To: multipathtcp@ietfa.amsl.com Delivered-To: multipathtcp@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2BDE113F9F2 for ; Mon, 30 Oct 2017 07:01:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.888 X-Spam-Level: X-Spam-Status: No, score=-1.888 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id RZ1QjVwmq0wx for ; Mon, 30 Oct 2017 07:01:51 -0700 (PDT) Received: from mailS.toulouse.viveris.com (mail.toulouse.viveris.com [212.99.125.10]) by ietfa.amsl.com (Postfix) with ESMTP id 252C713F9E5 for ; Mon, 30 Oct 2017 07:01:46 -0700 (PDT) Received: from hp (unknown [172.20.5.75]) by mailS.toulouse.viveris.com (Postfix) with ESMTPA id 3B2E0AC009B; Mon, 30 Oct 2017 15:01:43 +0100 (CET) To: mohamed.boucadair@orange.com, "multipathtcp@ietf.org" Cc: Joaquin Muguerza , "fabrice.arnal@thalesaleniaspace.com" , Kuhn Nicolas , Emmanuel Dubois , SALLANTIN Renaud , Riadh Dhaou , FASSON Julien References: <25b6b320-ccd8-13c1-1b36-182089a77252@toulouse.viveris.com> <787AE7BB302AE849A7480A190F8B93300A05E6E2@OPEXCLILMA3.corporate.adroot.infra.ftgroup> <787AE7BB302AE849A7480A190F8B93300A05F493@OPEXCLILMA3.corporate.adroot.infra.ftgroup> From: David Pradas Message-ID: <83b02ba6-2fe5-c01c-92ab-ac2201566702@toulouse.viveris.com> Date: Mon, 30 Oct 2017 15:01:43 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <787AE7BB302AE849A7480A190F8B93300A05F493@OPEXCLILMA3.corporate.adroot.infra.ftgroup> Content-Type: multipart/alternative; boundary="------------4C664FC8345D1F1D690F0C32" Content-Language: en-GB Archived-At: X-Mailman-Approved-At: Mon, 30 Oct 2017 07:52:43 -0700 Subject: Re: [multipathtcp] MPTCP transparent proxy X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Oct 2017 14:01:55 -0000 This is a multi-part message in MIME format. --------------4C664FC8345D1F1D690F0C32 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Hi Med, Thank you again for your feedback. Please find my comments inline. Cheers, David Le 27/10/2017 à 14:00, mohamed.boucadair@orange.com a écrit : > > Hi David, > > Thank you for clarifying. Much appreciated! > > Please see inline. > > Cheers, > > Med > > *De :*David Pradas [mailto:david.pradas@toulouse.viveris.com] > *Envoyé :* vendredi 27 octobre 2017 11:20 > *À :* BOUCADAIR Mohamed IMT/OLN; multipathtcp@ietf.org > *Cc :* Joaquin Muguerza; fabrice.arnal@thalesaleniaspace.com; Kuhn > Nicolas; Emmanuel Dubois; SALLANTIN Renaud; Riadh Dhaou; FASSON Julien > *Objet :* Re: [multipathtcp] MPTCP transparent proxy > > Hi Med, > > Thank you for your reply. Yes, indeed, we also sent the email to the > maintainers of the MPTCP implementation for further discussion > regarding the modification. But we wanted to share the context of the > study with the IETF mailing list since we thought it would be > interesting to have your feedback. > > Regarding your questions: > - Is there any reason why you decided to use the transparent proxy mode? > Your question is very relevant! It was a functional requirement, we > wanted to evaluated the system performance without NAT translation. > > [Med] Please note that even in the transparent mode, a ** translation > (NAT, if you will) ** is required for subsequent subflows: The proxy > will need to translate the internal IP address/port to the one used to > place the first subflow. Further, the transparent mode will require > that the traffic should be inspected to detect the MPTCP one. This > inspection function may have some implications on the system performance. > [David] Yes, indeed, the second mptcp subflow takes the source address of our proxy. Regarding the detection of MPTCP for the transparent mode, yes, this inspection might have an impact on the performances (CPU charge, RAM), even if does not seem to be the case of our platform --> But, indeed, it would be necessary to consider this impact on real systems, with many more flows to inspect. > > > - Did you considered to use the explicit mode? > We did not consider this mode, because we though that, even giving the > address list, the behaviour of the implementation will be the same: > i.e. fallback to TCP if the address is not present in the machine (to > be confirmed!). > > [Med] The behavior for subsequent subflows establishment would be the > same, but there are other advantages that are worth to be considered: > > -The proxy is not required to be embedded on an on-path router > > -Only the eligible traffic will be directed to the proxy; no need for > traffic inspection or hooks to invoke the proxy function > > -You can easily distinguish MPTCP proxied traffic vs. MPTCP flows that > are natively initiated by internal hosts. > [David] Thanks for this information! we were not aware of all these advantages. They are closely related to our discussion on your first question. > > > - How do you ensure that the proxy will be on-path whatever the link > you use to place the first subflow? > In fact, we always force the fist subflow to go through the > terrestrial link (and the second one through the satellite link). > Knowing that both link are aggregated by our proxy MPTCP-PEP. > > [Med] OK, thanks. > > > Kind regards, > > David > > > Le 26/10/2017 à 10:59, mohamed.boucadair@orange.com > a écrit : > > Dear David, all, > > Thank you for sharing this information. You may want to direct > this message to the maintainers of the MPTCP implementation you > mentioned. > > I have some architectural questions: Is there any reason why you > decided to use the transparent proxy mode? Did you considered to > use the explicit mode? How do you ensure that the proxy will be > on-path whatever the link you use to place the first subflow? > > Thank you. > > Cheers, > > Med > > *De :*multipathtcp [mailto:multipathtcp-bounces@ietf.org] *De la > part de* David Pradas > *Envoyé :* jeudi 26 octobre 2017 10:20 > *À :* multipathtcp@ietf.org > *Cc :* Joaquin Muguerza; fabrice.arnal@thalesaleniaspace.com > ; Kuhn Nicolas; > Emmanuel Dubois; SALLANTIN Renaud; Riadh Dhaou; FASSON Julien > *Objet :* [multipathtcp] MPTCP transparent proxy > > Dear All, > > We contact you regarding the MPTCP implementation (v0.92) and some > problems we have encountered in a specific use case (transparent > sockets). We will try to summarise the context of our study, as > well as the problem and the solutions we propose to solve it. > > The objective of the study has been to work on a MPTCP-PEP proxy, > where the proxy (PEPsal implementation) splits the TCP connection > and, with MPTCP, aggregates two link (satellite and terrestrial). > We have also focused on other scenarios (e.g. PEPsal only on the > satellite link), but we prefer to discuss only the one presented > in the figure below: > > While trying to put together our implementation of PEPsal > (transparent proxy) in a MPTCPcompliant kernel, we had to face a > problem with the MPTCP implementation due to the transparent > socketsusedin PEPsal. After carefully reading the MPTCP code, we > discovered that when opening new subflows (using the fullmesh > algorithm), first it is checked if the IP address of the main > subflow corresponds to any of the network interfaces on the > machine. This presents a problem when working with transparent > sockets, since these sockets can be bound to external IP > addresses, not present on the machine. In this case, the MPTCP > implementation falls back to a classical TCP connection, which is > not the behaviour wetarget. > > We assume such behaviour of  MPTCP implementation was a deliberate > choice (e.g. for security concerns). Is it actually the main > driver ? Could such compatibility with transparent proxying be > acceptable for subsequent MPTCP versions ? > We have proceeded to such code modification, and we are happy to > share it with you, for review and possible integration in the main > MPTCP code. You may decide for instance if this feature shall be > implemented under all circumstances, or restricted to a certain > mode only (e.g. activated through a control option, sysctl > command, ... ). > > Secondly,we have carried out some performances tests with > applications such as HTTP (measuring the page load time) or file > transfer over TCP, and we have observed that MPTCP outperforms (or > equals) the case where only one access is used (terrestrial or > satellite), specially under congestion conditions. That being > said, we expect to further work on this issue, mainly assessing > (1) the performance of MPTCP schedulers with such large asymmetry, > (2) the performance of the different coupled congestion control in > our use-case and (3) consider the relevance of the second sub-flow > opening (mainly for short flows). Do not hesitate to let us know > if you have any interest in collaborating in this future work. > > We attached herein the modification we used, which allows MPTCP to > work when using transparent sockets. > > We would be glad to discuss with you about this subject. > > Best Regards, > > David PRADAS > Joaquin MUGUERZA > > > --------------------/_ > > _/ > diff --git a/net/mptcp/mptcp_fullmesh.c b/net/mptcp/mptcp_fullmesh.c > index 1e5b753..665560a 100644 > --- a/net/mptcp/mptcp_fullmesh.c > +++ b/net/mptcp/mptcp_fullmesh.c > @@ -629,6 +629,38 @@ static void update_addr_bitfields(struct sock > *meta_sk, >         } >  } > > +static int mptcp_find_address_transp(const struct mptcp_loc_addr > *mptcp_local, > +                             sa_family_t family, const union > inet_addr *addr, > +                             int if_idx) > +{ > +       int i; > +       u8 loc_bits; > +       bool found = false; > + > +       if (family == AF_INET) > +               loc_bits = mptcp_local->loc4_bits; > +       else > +               loc_bits = mptcp_local->loc6_bits; > + > +       mptcp_for_each_bit_set(loc_bits, i) { > +               if (family == AF_INET && > +                   (!if_idx || mptcp_local->locaddr4[i].if_idx == > if_idx)) { > +                       found = true; > +                       break; > +               } > +               if (family == AF_INET6 && > +                   (!if_idx || mptcp_local->locaddr6[i].if_idx == > if_idx)) { > +                       found = true; > +                       break; > +               } > +       } > + > +       if (!found) > +               return -1; > + > +       return i; > +} > + >  static int mptcp_find_address(const struct mptcp_loc_addr > *mptcp_local, >                               sa_family_t family, const union > inet_addr *addr, >                               int if_idx) > @@ -1271,9 +1303,18 @@ static void full_mesh_new_session(const > struct sock *meta_sk) >         rcu_read_lock(); >         mptcp_local = rcu_dereference(fm_ns->local); > > -       index = mptcp_find_address(mptcp_local, family, &saddr, > if_idx); > -       if (index < 0) > +       if(inet_sk(meta_sk)->transparent) { > +               mptcp_debug("Meta socket is transparent"); > +               index = mptcp_find_address_transp(mptcp_local, > family, &saddr, if_idx); > +       } > +       else { > +               mptcp_debug("Meta socket is NOT transparent"); > +               index = mptcp_find_address(mptcp_local, family, > &saddr, if_idx); > +       } > +       if (index < 0) { > +               mptcp_debug("Falling back"); >                 goto fallback; > +       } > >         if (family == AF_INET) >                 master_tp->mptcp->low_prio = > mptcp_local->locaddr4[index].low_prio; > > --------------------// > > -- > *David PRADAS* > Responsable Technique de Projets > /(Ph.D. in Telecommunications) > Viveris Technologies > +33(0)561003088 > _david.pradas@toulouse.viveris.com > _ / > -- *David PRADAS* Responsable Technique de Projets /(Ph.D. in Telecommunications)/ Viveris Technologies +33(0)561003088 _david.pradas@toulouse.viveris.com_ ////// --------------4C664FC8345D1F1D690F0C32 Content-Type: multipart/related; boundary="------------CA5F57314170AD36E249D323" --------------CA5F57314170AD36E249D323 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit
Hi Med,

Thank you again for your feedback. Please find my comments inline.

Cheers,
David


Le 27/10/2017 à 14:00, mohamed.boucadair@orange.com a écrit :

Hi David,

 

Thank you for clarifying. Much appreciated!

 

Please see inline.

 

Cheers,

Med

 

De : David Pradas [mailto:david.pradas@toulouse.viveris.com]
Envoyé : vendredi 27 octobre 2017 11:20
À : BOUCADAIR Mohamed IMT/OLN; multipathtcp@ietf.org
Cc : Joaquin Muguerza; fabrice.arnal@thalesaleniaspace.com; Kuhn Nicolas; Emmanuel Dubois; SALLANTIN Renaud; Riadh Dhaou; FASSON Julien
Objet : Re: [multipathtcp] MPTCP transparent proxy

 

Hi Med,

Thank you for your reply. Yes, indeed, we also sent the email to the maintainers of the MPTCP implementation for further discussion regarding the modification. But we wanted to share the context of the study with the IETF mailing list since we thought it would be interesting to have your feedback.

Regarding your questions:
-  Is there any reason why you decided to use the transparent proxy mode?
Your question is very relevant! It was a functional requirement, we wanted to evaluated the system performance without NAT translation.

 

[Med] Please note that even in the transparent mode, a ** translation (NAT, if you will) ** is required for subsequent subflows: The proxy will need to translate the internal IP address/port to the one used to place the first subflow. Further, the transparent mode will require that the traffic should be inspected to detect the MPTCP one. This inspection function may have some implications on the system performance.

[David] Yes, indeed, the second mptcp subflow takes the source address of our proxy.
Regarding the detection of MPTCP for the transparent mode, yes, this inspection might have an impact on the performances (CPU charge, RAM), even if does not seem to be the case of our platform --> But, indeed, it would be necessary to consider this impact on real systems, with many more flows to inspect.


- Did you considered to use the explicit mode?
We did not consider this mode, because we though that, even giving the address list, the behaviour of the implementation will be the same: i.e. fallback to TCP if the address is not present in the machine (to be confirmed!).

 

[Med] The behavior for subsequent subflows establishment would be the same, but there are other advantages that are worth to be considered:

-    The proxy is not required to be embedded on an on-path router

-    Only the eligible traffic will be directed to the proxy; no need for traffic inspection or hooks to invoke the proxy function

-    You can easily distinguish MPTCP proxied traffic vs. MPTCP flows that are natively initiated by internal hosts.

[David] Thanks for this information! we were not aware of all these advantages. They are closely related to our discussion on your first question.


- How do you ensure that the proxy will be on-path whatever the link you use to place the first subflow?
In fact, we always force the fist subflow to go through the terrestrial link (and the second one through the satellite link). Knowing that both link are aggregated by our proxy MPTCP-PEP.

 

[Med] OK, thanks.   


Kind regards,

David


Le 26/10/2017 à 10:59, mohamed.boucadair@orange.com a écrit :

Dear David, all,

 

Thank you for sharing this information. You may want to direct this message to the maintainers of the MPTCP implementation you mentioned.

 

I have some architectural questions: Is there any reason why you decided to use the transparent proxy mode? Did you considered to use the explicit mode? How do you ensure that the proxy will be on-path whatever the link you use to place the first subflow?

 

Thank you.

 

Cheers,

Med

 

De : multipathtcp [mailto:multipathtcp-bounces@ietf.org] De la part de David Pradas
Envoyé : jeudi 26 octobre 2017 10:20
À : multipathtcp@ietf.org
Cc : Joaquin Muguerza; fabrice.arnal@thalesaleniaspace.com; Kuhn Nicolas; Emmanuel Dubois; SALLANTIN Renaud; Riadh Dhaou; FASSON Julien
Objet : [multipathtcp] MPTCP transparent proxy

 

Dear All,

We contact you regarding the MPTCP implementation (v0.92) and some problems we have encountered in a specific use case (transparent sockets). We will try to summarise the context of our study, as well as the problem and the solutions we propose to solve it.

The objective of the study has been to work on a MPTCP-PEP proxy, where the proxy (PEPsal implementation) splits the TCP connection and, with MPTCP, aggregates two link (satellite and terrestrial). We have also focused on other scenarios (e.g. PEPsal only on the satellite link), but we prefer to discuss only the one presented in the figure below:

 

While trying to put together our implementation of PEPsal (transparent proxy) in a MPTCP compliant kernel, we had to face a problem with the MPTCP implementation due to the transparent sockets used in PEPsal. After carefully reading the MPTCP code, we discovered that when opening new subflows (using the fullmesh algorithm), first it is checked if the IP address of the main subflow corresponds to any of the network interfaces on the machine. This presents a problem when working with transparent sockets, since these sockets can be bound to external IP addresses, not present on the machine. In this case, the MPTCP implementation falls back to a classical TCP connection, which is not the behaviour we target.

We assume such behaviour of  MPTCP implementation was a deliberate choice (e.g. for security concerns). Is it actually the main driver ? Could such compatibility with transparent proxying be acceptable for subsequent MPTCP versions ?
We have proceeded to such code modification, and we are happy to share it with you, for review and possible integration in the main MPTCP code. You may decide for instance if this feature shall be implemented under all circumstances, or restricted to a certain mode only (e.g. activated through a control option, sysctl command, ... ).

Secondly, we have carried out some performances tests with applications such as HTTP (measuring the page load time) or file transfer over TCP, and we have observed that MPTCP outperforms (or equals) the case where only one access is used (terrestrial or satellite), specially under congestion conditions. That being said, we expect to further work on this issue, mainly assessing (1) the performance of MPTCP schedulers with such large asymmetry, (2) the performance of the different coupled congestion control in our use-case and (3) consider the relevance of the second sub-flow opening (mainly for short flows). Do not hesitate to let us know if you have any interest in collaborating in this future work.

We attached herein the modification we used, which allows MPTCP to work when using transparent sockets.

We would be glad to discuss with you about this subject.

Best Regards,

David PRADAS
Joaquin MUGUERZA


--------------------


diff --git a/net/mptcp/mptcp_fullmesh.c b/net/mptcp/mptcp_fullmesh.c
index 1e5b753..665560a 100644
--- a/net/mptcp/mptcp_fullmesh.c
+++ b/net/mptcp/mptcp_fullmesh.c
@@ -629,6 +629,38 @@ static void update_addr_bitfields(struct sock *meta_sk,
        }
 }

+static int mptcp_find_address_transp(const struct mptcp_loc_addr *mptcp_local,
+                             sa_family_t family, const union inet_addr *addr,
+                             int if_idx)
+{
+       int i;
+       u8 loc_bits;
+       bool found = false;
+
+       if (family == AF_INET)
+               loc_bits = mptcp_local->loc4_bits;
+       else
+               loc_bits = mptcp_local->loc6_bits;
+
+       mptcp_for_each_bit_set(loc_bits, i) {
+               if (family == AF_INET &&
+                   (!if_idx || mptcp_local->locaddr4[i].if_idx == if_idx)) {
+                       found = true;
+                       break;
+               }
+               if (family == AF_INET6 &&
+                   (!if_idx || mptcp_local->locaddr6[i].if_idx == if_idx)) {
+                       found = true;
+                       break;
+               }
+       }
+
+       if (!found)
+               return -1;
+
+       return i;
+}
+
 static int mptcp_find_address(const struct mptcp_loc_addr *mptcp_local,
                              sa_family_t family, const union inet_addr *addr,
                              int if_idx)
@@ -1271,9 +1303,18 @@ static void full_mesh_new_session(const struct sock *meta_sk)
        rcu_read_lock();
        mptcp_local = rcu_dereference(fm_ns->local);

-       index = mptcp_find_address(mptcp_local, family, &saddr, if_idx);
-       if (index < 0)
+       if(inet_sk(meta_sk)->transparent) {
+               mptcp_debug("Meta socket is transparent");
+               index = mptcp_find_address_transp(mptcp_local, family, &saddr, if_idx);
+       }
+       else {
+               mptcp_debug("Meta socket is NOT transparent");
+               index = mptcp_find_address(mptcp_local, family, &saddr, if_idx);
+       }
+       if (index < 0) {
+               mptcp_debug("Falling back");
                goto fallback;
+       }

        if (family == AF_INET)
                master_tp->mptcp->low_prio = mptcp_local->locaddr4[index].low_prio;

 

--------------------

 

--
David PRADAS
Responsable Technique de Projets
(Ph.D. in Telecommunications)
Viveris Technologies
+33(0)561003088
david.pradas@toulouse.viveris.com


--
David PRADAS
Responsable Technique de Projets
(Ph.D. in Telecommunications)
Viveris Technologies
+33(0)561003088
david.pradas@toulouse.viveris.com
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x27mr761871lje.184.1509444361016; Tue, 31 Oct 2017 03:06:01 -0700 (PDT) MIME-Version: 1.0 Received: by 10.25.24.160 with HTTP; Tue, 31 Oct 2017 03:05:59 -0700 (PDT) From: Anand Nandugudi Date: Tue, 31 Oct 2017 11:05:59 +0100 Message-ID: To: multipathtcp@ietf.org, tcpm@ietf.org Content-Type: multipart/alternative; boundary="001a114b52def2696b055cd4e6f5" Archived-At: Subject: [multipathtcp] Fwd: New Version Notification for draft-bonaventure-mptcp-converters-02.txt X-BeenThere: multipathtcp@ietf.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Multi-path extensions for TCP List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 31 Oct 2017 10:06:06 -0000 --001a114b52def2696b055cd4e6f5 Content-Type: text/plain; charset="UTF-8" Name: draft-bonaventure-mptcp-converters Revision: 02 Title: 0-RTT TCP Converter Document date: 2017-10-30 Group: Individual Submission Pages: 32 URL: https://www.ietf.org/internet-drafts/draft-bonaventure- mptcp-converters-02.txt Status: https://datatracker.ietf.org/doc/draft-bonaventure-mptcp- converters/ Htmlized: https://tools.ietf.org/html/draft-bonaventure-mptcp- converters-02 Htmlized: https://datatracker.ietf.org/doc/html/draft-bonaventure- mptcp-converters-02 Diff: https://www.ietf.org/rfcdiff?url2=draft-bonaventure-mptcp- converters-02 Abstract: This document specifies an application proxy, called Transport Converter, to assist the deployment of Multipath TCP. This proxy is designed to avoid inducing extra delay when involved in a network- assisted connection (that is, 0-RTT). This specification assumes an explicit model, where the proxy is explicitly configured on hosts. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat -- ------------------------------ DISCLAIMER. This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. If you are not the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. --001a114b52def2696b055cd4e6f5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Name:=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0draft-bonaventure-mptcp-converters
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A002
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0-RTT TCP Converter
Document date:=C2=A0 2017-10-30
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 32
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draft-bon= aventure-mptcp-converters-02.txt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.org/doc/draft-bonaventure-mptcp-converters/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://tools.ietf.org/html/draft-bonaventure-mptcp-converters-0= 2
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.org/doc/html/draft-bonaventure-mptcp-converters-02
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://www.ietf.org/rfcdiff?url2=3Ddraft-bonaventu= re-mptcp-converters-02

Abstract:
=C2=A0 =C2=A0This document specifies an application proxy, called Transport=
=C2=A0 =C2=A0Converter, to assist the deployment of Multipath TCP.=C2=A0 Th= is proxy is
=C2=A0 =C2=A0designed to avoid inducing extra delay when involved in a netw= ork-
=C2=A0 =C2=A0assisted connection (that is, 0-RTT).=C2=A0 This specification= assumes an
=C2=A0 =C2=A0explicit model, where the proxy is explicitly configured on ho= sts.




Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat




DISCLAIMER.
This email and any files transmitted with it are confidential an= d intended solely for the use of the individual or entity to whom they are = addressed. If you have received this email in error please notify the syste= m manager. This message contains confidential information and is intended o= nly for the individual named. If you are not the named addressee you should= not disseminate, distribute or copy this e-mail. Please notify the sender = immediately by e-mail if you have received this e-mail by mistake and delet= e this e-mail from your system. If you are not the intended recipient you a= re notified that disclosing, copying, distributing or taking any action in = reliance on the contents of this information is strictly prohibited.= --001a114b52def2696b055cd4e6f5--