net/ip6_tunnel: Prevent perpetual tunnel growth

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[ Upstream commit 21f4d45eba ]

Similarly to ipv4 tunnel, ipv6 version updates dev->needed_headroom, too.
While ipv4 tunnel headroom adjustment growth was limited in
commit 5ae1e9922b ("net: ip_tunnel: prevent perpetual headroom growth"),
ipv6 tunnel yet increases the headroom without any ceiling.

Reflect ipv4 tunnel headroom adjustment limit on ipv6 version.

Credits to Francesco Ruggeri, who was originally debugging this issue
and wrote local Arista-specific patch and a reproducer.

Fixes: 8eb30be035 ("ipv6: Create ip6_tnl_xmit")
Cc: Florian Westphal <fw@strlen.de>
Cc: Francesco Ruggeri <fruggeri05@gmail.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Link: https://patch.msgid.link/20251009-ip6_tunnel-headroom-v2-1-8e4dbd8f7e35@arista.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Dmitry Safonov 2025-10-09 16:02:19 +01:00 • committed by Greg Kroah-Hartman

parent 55de193d5e

commit b6eb25d870

3 changed files with 16 additions and 16 deletions

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15

include/net/ip_tunnels.h

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14

net/ipv4/ip_tunnel.c

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3

net/ipv6/ip6_tunnel.c

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