Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback
Justin Iurman <justin.iurman@uliege.be> Wed, 07 June 2023 11:24 UTC
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Date: Wed, 07 Jun 2023 13:24:24 +0200
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To: Erik Kline <ek.ietf@gmail.com>, Tal Mizrahi <tal.mizrahi.phd@gmail.com>
Cc: "int-area@ietf.org" <int-area@ietf.org>, Bob Hinden <bob.hinden@gmail.com>, ipv6@ietf.org
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From: Justin Iurman <justin.iurman@uliege.be>
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Subject: Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback
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On 6/7/23 08:06, Erik Kline wrote: > Poking around the Linux kernel source, my reading of net/ipv6/icmp.c's > icmpv6_rcv() is that it checks the type byte before dispatching to > icmpv6_echo_reply(), and inside icmpv6_echo_reply() I'm not seeing any > checking of the code byte, so I'd assume (without testing) that it > just constructs a normal echo reply. I also suspect that it just > copies the incoming code value into the reply. > > The only differentiation I see being made is between echo request > (4443) and extended echo request (8335). > > Should be easy enough to test (after I get a few other things done). +1 ... tested and confirmed (pcap attached, code 0 for packets 1-2, code 1 for packets 3-4). Cheers, Justin > On Tue, Jun 6, 2023 at 9:30 PM Tal Mizrahi <tal.mizrahi.phd@gmail.com> wrote: >> >> Bob, Eric, >> >> Thanks for the feedback. >> Defining a new code for ICMPv6 Echo rather than defining a new type >> may be the right way to go. >> Our main concern with this is that RFC 4443 defines what to do with an >> unknown type, but does not define what to do with an unknown code. It >> is not clear what existing implementations do when receiving an Echo >> Request with an unknown code. That is why the current draft calls for >> a new type. However, we are open to more feedback about this, and it >> may end up being just a new code. >> >> Cheers, >> Tal. >> >> On Tue, Jun 6, 2023 at 8:33 PM Eric Vyncke (evyncke) <evyncke@cisco.com> wrote: >>> >>> Without any hat, I agree with Bob. >>> >>> This I-D should eventually go to 6MAN WG though (with my AD hat) >>> >>> -éric >>> >>> On 06/06/2023, 08:34, "Int-area on behalf of Bob Hinden" <int-area-bounces@ietf.org <mailto:int-area-bounces@ietf.org> on behalf of bob.hinden@gmail.com <mailto:bob.hinden@gmail.com>> wrote: >>> >>> >>> Tal, >>> >>> >>> I did a quick read of your draft. >>> >>> >>> As noted in the draft this seems to be very similar to ICMPv6 Echo/Echo Reply. The change is to include the request packet in the response, not just the payload. >>> >>> >>> While I don’t have any real opinion on the need for this, I do think it would be a lot simpler if the draft just defined a new Code field value for Echo Request/Reply that specified this behavior. Currently the Code field is set to zero, another value could specify this behavior. >>> >>> >>> Deployment might be easier as I suspect ICMPv6 types other than the current definitions will be filtered in many places. >>> >>> >>> Bob >>> >>> >>> >>> >>> >>> >>>> On Jun 6, 2023, at 4:54 AM, Tal Mizrahi <tal.mizrahi.phd@gmail.com <mailto:tal.mizrahi.phd@gmail.com>> wrote: >>>> >>>> Hi, >>>> >>>> New draft: https://datatracker.ietf.org/doc/draft-mcb-intarea-icmpv6-loopback/ <https://datatracker.ietf.org/doc/draft-mcb-intarea-icmpv6-loopback/> >>>> >>>> We have posted a new draft that proposes two new ICMPv6 message types: >>>> Loopback Request and Reply. >>>> ICMPv6 Loopback is very similar to Echo, except that after a Loopback >>>> Request is sent, its corresponding Reply includes as much of the IPv6 >>>> Loopback Request packet as possible, including the IPv6 header and >>>> IPv6 extension headers and options if they are present. >>>> >>>> We believe that ICMPv6 Loopback can be very useful for returning IPv6 >>>> options that were included in Request packet back to the sender, >>>> including for example sending IOAM [RFC 9197] data from the Request >>>> back to the sender, sending the SRH [RFC 8754] of the Request back to >>>> the sender, as well as for in-progress / future protocols such as >>>> draft-filsfils-spring-path-tracing and draft-kumar-ippm-ifa. >>>> >>>> We would be happy for feedback, as well as suggestions about whether >>>> the INT-AREA WG is the right place to discuss this draft. >>>> >>>> Cheers, >>>> Tal. >>>> >>>> _______________________________________________ >>>> Int-area mailing list >>>> Int-area@ietf.org <mailto:Int-area@ietf.org> >>>> https://www.ietf.org/mailman/listinfo/int-area <https://www.ietf.org/mailman/listinfo/int-area> >>> >>> >>> >>> >>> >> >> -------------------------------------------------------------------- >> IETF IPv6 working group mailing list >> ipv6@ietf.org >> Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >> -------------------------------------------------------------------- > > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > --------------------------------------------------------------------
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Tal Mizrahi
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Erik Kline
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Justin Iurman
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Luigi IANNONE
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Florian Obser
- Re: [IPv6] [EXTERNAL] Re: [Int-area] New Draft - … Robinson, Herbie
- Re: [IPv6] [EXTERNAL] Re: [Int-area] New Draft - … Tal Mizrahi
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Michael Richardson
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Tianran Zhou
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Tal Mizrahi
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Michael Richardson
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback Tal Mizrahi
- Re: [IPv6] [Int-area] New Draft - ICMPv6 Loopback waldemar