netdev - [PATCH] xfrm: fix state migration replay sequence numbers

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Date:   Thu, 18 May 2017 16:39:53 +0200
From:   Antony Antony <antony@...nome.org>
To:     netdev@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>
Cc:     Richard Guy Briggs <rgb@...colour.ca>,
        Antony Antony <antony@...nome.org>
Subject: [PATCH] xfrm: fix state migration replay sequence numbers

During xfrm migration replay and preplay sequence numbers are not 
copied from the previous state. 

Here is tcpdump output showing the problem.
10.0.10.46 is running vanilla kernel, IKE/IPsec responder.
After the migration it sent wrong sequence number, reset to 1.
The migration is from 10.0.0.52 to 10.0.0.53.

IP 10.0.0.52.4500 > 10.0.10.46.4500: UDP-encap: ESP(spi=0x43ef462d,seq=0x7cf), length 136
IP 10.0.10.46.4500 > 10.0.0.52.4500: UDP-encap: ESP(spi=0xca1c282d,seq=0x7cf), length 136
IP 10.0.0.52.4500 > 10.0.10.46.4500: UDP-encap: ESP(spi=0x43ef462d,seq=0x7d0), length 136
IP 10.0.10.46.4500 > 10.0.0.52.4500: UDP-encap: ESP(spi=0xca1c282d,seq=0x7d0), length 136

IP 10.0.0.53.4500 > 10.0.10.46.4500: NONESP-encap: isakmp: child_sa  inf2[I]
IP 10.0.10.46.4500 > 10.0.0.53.4500: NONESP-encap: isakmp: child_sa  inf2[R]
IP 10.0.0.53.4500 > 10.0.10.46.4500: NONESP-encap: isakmp: child_sa  inf2[I]
IP 10.0.10.46.4500 > 10.0.0.53.4500: NONESP-encap: isakmp: child_sa  inf2[R]

IP 10.0.0.53.4500 > 10.0.10.46.4500: UDP-encap: ESP(spi=0x43ef462d,seq=0x7d1), length 136

NOTE: next sequence is wrong 0x1

IP 10.0.10.46.4500 > 10.0.0.53.4500: UDP-encap: ESP(spi=0xca1c282d,seq=0x1), length 136
IP 10.0.0.53.4500 > 10.0.10.46.4500: UDP-encap: ESP(spi=0x43ef462d,seq=0x7d2), length 136
IP 10.0.10.46.4500 > 10.0.0.53.4500: UDP-encap: ESP(spi=0xca1c282d,seq=0x2), length 136

The attached patch fix it by copying replay and preplay.

regards,
-antony

Antony Antony (1):
  xfrm: fix state migration replay sequence numbers

 net/xfrm/xfrm_state.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.9.3


View attachment "0001-xfrm-fix-state-migration.patch" of type "text/plain" (1018 bytes)