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Date:   Mon, 29 Apr 2019 11:23:55 -0600
From:   Captain Wiggum <captwiggum@...il.com>
To:     Peter Oskolkov <posk@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, netdev@...r.kernel.org,
        Peter Oskolkov <posk@...k.io>,
        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

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:

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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