From: Jakub Kicinski <kuba@kernel.org>
To: Reji Thomas <rejithomas.d@gmail.com>
Cc: Reji Thomas <rejithomas@juniper.net>,
davem@davemloft.net, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>,
Mathieu Xhonneux <m.xhonneux@gmail.com>,
David Lebrun <david.lebrun@uclouvain.be>
Subject: Re: [PATCH v2] IPv6: sr: Fix End.X nexthop to use oif.
Date: Mon, 19 Oct 2020 09:17:02 -0700 [thread overview]
Message-ID: <20201019091702.5b26870c@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <CAA8Zg7Gcua1=6CgSkJ-z8uKJneDjedB4z6zm2a+DcYt-_YcmSQ@mail.gmail.com>
On Mon, 19 Oct 2020 09:25:12 +0530 Reji Thomas wrote:
> > > @@ -566,7 +583,8 @@ static struct seg6_action_desc seg6_action_table[] = {
> > > },
> > > {
> > > .action = SEG6_LOCAL_ACTION_END_X,
> > > - .attrs = (1 << SEG6_LOCAL_NH6),
> > > + .attrs = ((1 << SEG6_LOCAL_NH6) |
> > > + (1 << SEG6_LOCAL_OIF)),
> > > .input = input_action_end_x,
> > > },
> > > {
> >
> > If you set this parse_nla_action() will reject all
> > SEG6_LOCAL_ACTION_END_X without OIF.
> >
> > As you say the OIF is only required for using link local addresses,
> > so this change breaks perfectly legitimate configurations.
> >
> > Can we instead only warn about the missing OIF, and only do that when
> > nh is link local?
> >
> End.X is defined as an adjacency-sid and is used to select a specific link to a
> neighbor for both global and link-local addresses. The intention was
> to drop the
> packet even for global addresses if the route via the specific
> interface is not found.
> Alternatively(believe semantically correct for End.X definition) I
> could do a neighbor lookup
> for nexthop address over specific interface and send the packet out.
If we can save the device lookup and still be semantically correct,
that's probably better.
next prev parent reply other threads:[~2020-10-19 16:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-15 8:21 [PATCH v2] IPv6: sr: Fix End.X nexthop to use oif Reji Thomas
2020-10-18 23:01 ` Jakub Kicinski
2020-10-19 3:55 ` Reji Thomas
2020-10-19 16:17 ` Jakub Kicinski [this message]
2020-10-20 12:25 ` Reji Thomas
2020-10-20 9:28 ` Ahmed Abdelsalam
2020-10-20 9:34 ` Ahmed Abdelsalam
2020-10-20 12:35 ` Reji Thomas
2020-10-21 8:12 ` Ahmed Abdelsalam
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201019091702.5b26870c@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com \
--to=kuba@kernel.org \
--cc=davem@davemloft.net \
--cc=david.lebrun@uclouvain.be \
--cc=linux-kernel@vger.kernel.org \
--cc=lkp@intel.com \
--cc=m.xhonneux@gmail.com \
--cc=netdev@vger.kernel.org \
--cc=rejithomas.d@gmail.com \
--cc=rejithomas@juniper.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).