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Date:   Mon, 29 Apr 2019 10:31:59 -0700
From:   Peter Oskolkov <posk@...k.io>
To:     Captain Wiggum <captwiggum@...il.com>
Cc:     Peter Oskolkov <posk@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, linux-netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Sasha Levin <sashal@...nel.org>, Lars Persson <lists@...h.nu>
Subject: Re: [PATCH 4.9 stable 0/5] net: ip6 defrag: backport fixes

On Mon, Apr 29, 2019 at 10:24 AM Captain Wiggum <captwiggum@...il.com> wrote:
>
> Hi Peter,
>
> I forgot to mention one thing about the 4.9 patch set.
> When patching against 4.9.170, I had to remove a couple of snippets
> that were already in release:

Hi John, I see these checks still present in 4.4.171. Maybe you had
them removed in
your local branch?

>
> Patch #604 (linux-4.9-4-ip6-defrag-use-rbtrees.patch):
> + /usr/bin/cat /home/admin/WORK/os/PACKAGES/kernel49/WORK/linux-4.9-4-ip6-defrag-use-rbtrees.patch
> + /usr/bin/patch -p1 -b --suffix .ip6-4 --fuzz=0
> patching file include/net/ipv6_frag.h
> patching file net/ipv6/reassembly.c
> Hunk #10 FAILED at 357.
> Hunk #11 succeeded at 374 (offset -4 lines).
> 1 out of 11 hunks FAILED -- saving rejects to file net/ipv6/reassembly.c.rej
>
> --- net/ipv6/reassembly.c
> +++ net/ipv6/reassembly.c
> @@ -357,10 +258,6 @@
>                 return 1;
>         }
>
> -       if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
> -           fhdr->frag_off & htons(IP6_MF))
> -               goto fail_hdr;
> -
>         iif = skb->dev ? skb->dev->ifindex : 0;
>         fq = fq_find(net, fhdr->identification, hdr, iif);
>         if (fq) {
>
> Patch #605 (linux-4.9-5-ip6-defrag-use-rbtrees-in-nf_conntrack_reasm.patch):
> + /usr/bin/cat /home/admin/WORK/os/PACKAGES/kernel49/WORK/linux-4.9-5-ip6-defrag-use-rbtrees-in-nf_conntrack_reasm.patch
> + /usr/bin/patch -p1 -b --suffix .ip6-5 --fuzz=0
> patching file net/ipv6/netfilter/nf_conntrack_reasm.c
> Hunk #8 FAILED at 464.
> Hunk #9 succeeded at 475 (offset -4 lines).
> 1 out of 9 hunks FAILED -- saving rejects to file
> net/ipv6/netfilter/nf_conntrack_reasm.c.rej
>
> --- net/ipv6/netfilter/nf_conntrack_reasm.c
> +++ net/ipv6/netfilter/nf_conntrack_reasm.c
> @@ -464,10 +363,6 @@
>         hdr = ipv6_hdr(skb);
>         fhdr = (struct frag_hdr *)skb_transport_header(skb);
>
> -       if (skb->len - skb_network_offset(skb) < IPV6_MIN_MTU &&
> -           fhdr->frag_off & htons(IP6_MF))
> -               return -EINVAL;
> -
>         skb_orphan(skb);
>         fq = fq_find(net, fhdr->identification, user, hdr,
>                      skb->dev ? skb->dev->ifindex : 0);
>
> On Mon, Apr 29, 2019 at 10:57 AM Captain Wiggum <captwiggum@...il.com> wrote:
> >
> > I have run the 4.9 patch set on the full TAHI test sweet.
> > Similar to 4.14, it does fix all the IPv6 frag header issues.
> > But the "change MTU" mesg routing is still broken.
> > Overall, it fixes what it was intended to fix, so I suggest it move
> > toward release.
> > Thanks Peter!
> >
> > --John Masinter
> >
> > On Fri, Apr 26, 2019 at 9:41 AM Peter Oskolkov <posk@...gle.com> wrote:
> > >
> > > This is a backport of a 5.1rc patchset:
> > >   https://patchwork.ozlabs.org/cover/1029418/
> > >
> > > Which was backported into 4.19:
> > >   https://patchwork.ozlabs.org/cover/1081619/
> > >
> > > and into 4.14:
> > >   https://patchwork.ozlabs.org/cover/1089651/
> > >
> > >
> > > This 4.9 patchset is very close to the 4.14 patchset above
> > > (cherry-picks from 4.14 were almost clean).
> > >
> > >
> > > Eric Dumazet (1):
> > >   ipv6: frags: fix a lockdep false positive
> > >
> > > Florian Westphal (1):
> > >   ipv6: remove dependency of nf_defrag_ipv6 on ipv6 module
> > >
> > > Peter Oskolkov (3):
> > >   net: IP defrag: encapsulate rbtree defrag code into callable functions
> > >   net: IP6 defrag: use rbtrees for IPv6 defrag
> > >   net: IP6 defrag: use rbtrees in nf_conntrack_reasm.c
> > >
> > >  include/net/inet_frag.h                   |  16 +-
> > >  include/net/ipv6.h                        |  29 --
> > >  include/net/ipv6_frag.h                   | 111 +++++++
> > >  net/ieee802154/6lowpan/reassembly.c       |   2 +-
> > >  net/ipv4/inet_fragment.c                  | 293 ++++++++++++++++++
> > >  net/ipv4/ip_fragment.c                    | 295 +++---------------
> > >  net/ipv6/netfilter/nf_conntrack_reasm.c   | 273 +++++-----------
> > >  net/ipv6/netfilter/nf_defrag_ipv6_hooks.c |   3 +-
> > >  net/ipv6/reassembly.c                     | 361 ++++++----------------
> > >  net/openvswitch/conntrack.c               |   1 +
> > >  10 files changed, 631 insertions(+), 753 deletions(-)
> > >  create mode 100644 include/net/ipv6_frag.h
> > >
> > > --
> > > 2.21.0.593.g511ec345e18-goog
> > >

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