netdev - [PATCH net 0/2] net: ipv6: seg6: headroom fixes

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Message-Id: <20200204173019.4437-1-alex.aring@gmail.com>
Date:   Tue,  4 Feb 2020 12:30:17 -0500
From:   Alexander Aring <alex.aring@...il.com>
To:     davem@...emloft.net
Cc:     kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, kuba@...nel.org,
        netdev@...r.kernel.org, andrea.mayer@...roma2.it,
        dav.lebrun@...il.com, mcr@...delman.ca, stefan@...enfreihafen.org,
        Alexander Aring <alex.aring@...il.com>
Subject: [PATCH net 0/2] net: ipv6: seg6: headroom fixes

Hi netdev,

This patch series fixes issues which I discovered while implementing RPL
source routing for 6LoWPAN interfaces. 6LoWPAN interfaces are using a MTU
of 1280 which is the IPv6 minimum MTU. I suppose this is the right fix to
do that according to my explanation that tunnels which acting before L3
need to set this headroom. So far I see only segmentation route is affected
to it. Maybe BPF tunnels, but it depends on the case... Maybe a comment
need to be added there as well to not getting confused. If wanted I can
send another patch for a comment for net-next or even net? May the
variable should be renamed to l2_headroom?

I splitted this fix in two patches, I only tested the first one and I
think the second one. The second one should fix issues as well.

Open to discuss my patches and if isn't the real fix... how we fix it?

I cc'ed all necessary people and Andrea which seems to have some net-next
patches around who should consider this fix in their new patches.

- Alex

Alexander Aring (2):
  net: ipv6: seg6_iptunnel: set tunnel headroom to zero
  net: ipv6: seg6_local: don't set headroom

 net/ipv6/seg6_iptunnel.c | 2 --
 net/ipv6/seg6_local.c    | 7 -------
 2 files changed, 9 deletions(-)

-- 
2.20.1