netdev - [PATCH net-next v3 0/4] Take care of xfrm policy when checking dst entries

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Date:	Tue, 11 Sep 2012 10:09:43 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	vyasevich@...il.com, davem@...emloft.net, eric.dumazet@...il.com,
	sds@...ho.nsa.gov, james.l.morris@...cle.com, eparis@...isplace.org
Cc:	sri@...ibm.com, linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH net-next v3 0/4] 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.

v3: remove unrelated "#ifdef CONFIG_XFRM" in IPv6 part
    bump rt_genid in selinux code (same place than flow_cache_genid)

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

Comments are welcome.

Regards,
Nicolas

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