tree 5d37cc5b78981164b97d5936e76f5a71b3edb2a5
parent 75fe59c8417deb81bc940ca439d6382d98827dbe
author Maciej Żenczykowski <maze@google.com> 1600892295 -0700
committer Sauvik Saha <ssaha@codeaurora.org> 1604639176 +0530

net/ipv4: always honour route mtu during forwarding

Documentation/networking/ip-sysctl.txt:46 says:
  ip_forward_use_pmtu - BOOLEAN
    By default we don't trust protocol path MTUs while forwarding
    because they could be easily forged and can lead to unwanted
    fragmentation by the router.
    You only need to enable this if you have user-space software
    which tries to discover path mtus by itself and depends on the
    kernel honoring this information. This is normally not the case.
    Default: 0 (disabled)
    Possible values:
    0 - disabled
    1 - enabled

Which makes it pretty clear that setting it to 1 is a potential
security/safety/DoS issue, and yet it is entirely reasonable to want
forwarded traffic to honour explicitly administrator configured
route mtus (instead of defaulting to device mtu).

Indeed, I can't think of a single reason why you wouldn't want to.
Since you configured a route mtu you probably know better...

It is pretty common to have a higher device mtu to allow receiving
large (jumbo) frames, while having some routes via that interface
(potentially including the default route to the internet) specify
a lower mtu.

Note that ipv6 forwarding uses device mtu unless the route is locked
(in which case it will use the route mtu).

This approach is not usable for IPv4 where an 'mtu lock' on a route
also has the side effect of disabling TCP path mtu discovery via
disabling the IPv4 DF (don't frag) bit on all outgoing frames.

I'm not aware of a way to lock a route from an IPv6 RA, so that also
potentially seems wrong.

Signed-off-by: Maciej Żenczykowski <maze@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: Sunmeet Gill (Sunny) <sgill@qti.qualcomm.com>
Cc: Vinay Paradkar <vparadka@qti.qualcomm.com>
Cc: Tyler Wear <twear@qti.qualcomm.com>
Cc: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
(Backported from commit 02a1b175b0e92d9e0fa5df3957ade8d733ceb6a0).

Change-Id: I26f336f891711f0149b2835d2c4a78fc8407b5ba
Git-Commit: 02a1b175b0e92d9e0fa5df3957ade8d733ceb6a0
Git-repo: https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux
Signed-off-by: Sauvik Saha <ssaha@codeaurora.org>