netdev - [PATCH net-next v2] Take care of xfrm policy when checking dst entries

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Date:	Mon, 10 Sep 2012 15:22:14 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	vyasevich@...il.com, davem@...emloft.net, eric.dumazet@...il.com
Cc:	sri@...ibm.com, linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next v2] Take care of xfrm policy when checking dst entries

The goal of these patches is to fix the following problem: a session is
established (TCP, SCTP) and after a new policy is inserted. The current
code does not recalculate the route, thus the traffic is not encrypted.

The patch propose to check flow_cache_genid value when checking a dst
entry, which is incremented each time a policy is inserted or deleted.

v2: use net->ipv4.rt_genid instead of flow_cache_genid (and thus save a test
    in fast path). Also move it to net->rt_genid, to be able to use it for IPv6
    too. Note that IPv6 will have one more test in fast path.

Patches are tested with TCP and SCTP, IPv4 and IPv6.

Comments are welcome.

Regards,
Nicolas

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