netdev - Bisected 4.14 Regression: IPsec transport mode breakage

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Message-ID: <20171115164619.jm45l5n3pbuabu5q@kevinolos>
Date:   Wed, 15 Nov 2017 09:46:19 -0700
From:   Kevin Locke <kevin@...inlocke.name>
To:     netdev@...r.kernel.org
Cc:     Steffen Klassert <steffen.klassert@...unet.com>
Subject: Bisected 4.14 Regression: IPsec transport mode breakage

Hi all,

I am using an L2TP/IPsec (transport mode) VPN connection from a client
behind a NAT running Debian with strongswan 5.6.0-2 and xl2tpd
1.3.10-1 to a Cisco Meraki MX60 with a public IP.  The connection
works with kernel 4.13 but not with kernel 4.14.  With 4.14 the IPsec
connection appears to be established correctly but xl2tpd is unable to
establish the L2TP connection.  The relevant error from syslog is:

charon: 09[KNL] creating acquire job for policy 192.168.21.10/32[udp/l2f] === X.X.X.X/32[udp/l2f] with reqid {1}
charon: 12[CFG] trap not found, unable to acquire reqid 1

I have bisected the issue to commit c9f3f813d462.  I have attached the
client ipsec.conf as well as the syslog during the connection attempt
for both c9f3f813d462 (bad) and cf3796675174 (good).  Meraki IPs have
been redacted to protect the innocent.

I'd appreciate any assistance in fixing the issue.  Let me know if
there's anything else I can do to help troubleshoot or test.

P.S.  Please CC me, as I am not subscribed to netdev@.  Thanks!

-- 
Thanks,      |  kevin@...inlocke.name    | XMPP: kevin@...inlocke.name
Kevin        |  https://kevinlocke.name  | IRC:   kevinoid on freenode

View attachment "ipsec.conf" of type "text/plain" (462 bytes)

View attachment "c9f3f813d462-bad.syslog" of type "text/plain" (13133 bytes)

View attachment "cf3796675174-good.syslog" of type "text/plain" (18687 bytes)