netdev - IPSec tunnels with compression are broken since 4.14

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Date:   Sun, 24 Dec 2017 23:20:34 +0200
From:   Serguei Ivantsov <me@....net>
To:     netdev@...r.kernel.org
Subject: IPSec tunnels with compression are broken since 4.14

Hi,

Found weird issue starting from 4.14 kernels.
IPSec tunnels with IPComp enabled are not working.
There are a couple of similar reports in strongSwan's wiki and mailing 
list.
Resolution is simple - disable compression.
I have tested all kernels from 4.14 to 4.14.8 - does not work. But works 
fine with any earlier kernel like 4.13.x
Both ikev1 and ikev2 are affected.
According to ipsec statusall, connection was established, but no traffic 
routed - can't ping, etc.

rt6-center[6]: ESTABLISHED 3 minutes ago, 
XX.XX.XX.XX[rt6]...YY.YY.YY.YY[center]
rt6-center[6]: IKEv2 SPIs: d7bd02a630bcd9b9_i 676e1ad3da512c68_r*, 
rekeying in 2 hours
rt6-center[6]: IKE proposal: 
AES_CBC_128/HMAC_SHA2_256_128/PRF_HMAC_SHA2_256/CURVE_25519
rt6-center{2}:  INSTALLED, TUNNEL, reqid 2, ESP in UDP SPIs: c1b5ec2b_i 
ce572160_o, IPCOMP CPIs: 2c8c_i 0ca7_o
rt6-center{2}:  AES_CBC_128/HMAC_SHA2_256_128, 0 bytes_i, 0 bytes_o, 
rekeying in 35 minutes
rt6-center{2}:   XX.XX.XX.XX/32 === 10.1.0.1/32

Regards,
  Serguei