From: Nicolas Dichtel <nicolas.dichtel@6wind•com>
To: Vlad Yasevich <vyasevich@gmail•com>
Cc: sri@us•ibm.com, linux-sctp@vger•kernel.org, netdev@vger•kernel.org
Subject: Re: [PATCH] sctp: check dst validity after IPsec operations
Date: Fri, 07 Sep 2012 14:24:46 +0200 [thread overview]
Message-ID: <5049E78E.6080908@6wind.com> (raw)
In-Reply-To: <5048D774.3020008@gmail.com>
Le 06/09/2012 19:03, Vlad Yasevich a écrit :
> On 09/06/2012 12:40 PM, Nicolas Dichtel wrote:
>> Le 06/09/2012 18:04, Vlad Yasevich a écrit :
>>> On 09/06/2012 01:40 PM, Nicolas Dichtel wrote:
>>>> dst stored in struct sctp_transport needs to be recalculated when
>>>> ipsec policy
>>>> are updated. We use flow_cache_genid for that.
>>>>
>>>> For example, if a SCTP connection is established and then an IPsec
>>>> policy is
>>>> set, the old SCTP flow will not be updated and thus will not use the new
>>>> IPsec policy.
>>>>
>>>> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind•com>
>>>
>>> why doesn't this need to be done for TCP? What makes SCTP special in
>>> this case?
>> Tests prove that the pb does not exist with TCP. I made the patch some
>> times ago, I will look again deeply to find the difference.
>>
>
> TCP appears to cache the flowi and uses that to re-route the packet.
> However, re-route still seems predicated on dst_check()...
Yes ... but I don't find the difference. Re-route is not done immediately in
TCP, it takes few seconds.
>
>>>
>>> ip_queue_xmit does an __sk_dst_check() which is essentially what
>>> sctp_transport_dst_check() does. That should determine if the
>>> currently cached
>>> route is valid or not.
>> The problem is that route will not be invalidated, because dst->check()
>> has no xfrm path so xfrm_dst_check() will never be called.
>>
>
> Shouldn't the cache be invalidated in this case? If the cache is invalidated,
> that should cause a new lookup. If the cache isn't invalidated, then any
> established connections that may now be impacted by the policy will not pick it up.
Yes, you're right. If I flush the cache manually (with the sysctl), route are
correctly updated.
I will send a new proposal.
Regards,
Nicolas
next prev parent reply other threads:[~2012-09-07 12:24 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-06 17:40 [PATCH] sctp: check dst validity after IPsec operations Nicolas Dichtel
2012-09-06 16:04 ` Vlad Yasevich
2012-09-06 16:40 ` Nicolas Dichtel
2012-09-06 17:03 ` Vlad Yasevich
2012-09-07 12:24 ` Nicolas Dichtel [this message]
2012-09-07 12:07 ` Nicolas Dichtel
2012-09-06 18:10 ` David Miller
2012-09-07 13:47 ` Nicolas Dichtel
2012-09-07 15:57 ` [PATCH RFC net-next 0/2] Take care of xfrm policy when checking dst entries Nicolas Dichtel
2012-09-07 15:57 ` [PATCH 1/2] dst: take into account policy update on check() Nicolas Dichtel
2012-09-07 14:20 ` Vlad Yasevich
2012-09-07 14:35 ` Eric Dumazet
2012-09-07 14:47 ` Nicolas Dichtel
2012-09-07 15:09 ` Eric Dumazet
2012-09-07 15:13 ` Nicolas Dichtel
2012-09-07 15:21 ` Eric Dumazet
2012-09-07 18:48 ` David Miller
2012-09-07 18:48 ` David Miller
2012-09-10 12:47 ` Nicolas Dichtel
2012-09-10 13:10 ` Eric Dumazet
2012-09-10 13:22 ` [PATCH net-next v2] Take care of xfrm policy when checking dst entries Nicolas Dichtel
2012-09-10 13:22 ` [PATCH net-next v2 1/4] netns: move net->ipv4.rt_genid to net->rt_genid Nicolas Dichtel
2012-09-10 13:22 ` [PATCH net-next v2 2/4] xfrm: invalidate dst on policy insertion/deletion Nicolas Dichtel
2012-09-10 14:21 ` Vlad Yasevich
2012-09-10 14:56 ` Nicolas Dichtel
2012-09-11 8:09 ` [PATCH net-next v3 0/4] Take care of xfrm policy when checking dst entries Nicolas Dichtel
2012-09-11 8:09 ` [PATCH net-next v3 1/4] netns: move net->ipv4.rt_genid to net->rt_genid Nicolas Dichtel
2012-09-11 8:09 ` [PATCH net-next v3 2/4] xfrm: invalidate dst on policy insertion/deletion Nicolas Dichtel
2012-09-11 8:09 ` [PATCH net-next v3 3/4] ipv6: use net->rt_genid to check dst validity Nicolas Dichtel
2012-09-11 8:09 ` [PATCH net-next v3 4/4] ipv6: use DST_* macro to set obselete field Nicolas Dichtel
2012-09-12 7:40 ` Eric Dumazet
2012-09-17 16:49 ` [PATCH net-next v3 0/4] Take care of xfrm policy when checking dst entries David Miller
2012-09-17 18:14 ` Vlad Yasevich
2012-09-17 18:25 ` David Miller
2012-09-17 19:52 ` Nicolas Dichtel
2012-09-17 19:54 ` David Miller
2012-09-18 20:08 ` David Miller
2012-09-10 13:22 ` [PATCH net-next v2 3/4] ipv6: use net->rt_genid to check dst validity Nicolas Dichtel
2012-09-10 14:29 ` Vlad Yasevich
2012-09-10 14:34 ` Nicolas Dichtel
2012-09-10 14:43 ` Vlad Yasevich
2012-09-10 14:44 ` Nicolas Dichtel
2012-09-10 13:22 ` [PATCH net-next v2 4/4] ipv6: use DST_* macro to set obselete field Nicolas Dichtel
2012-09-10 14:35 ` [PATCH net-next v2] Take care of xfrm policy when checking dst entries Vlad Yasevich
2012-09-10 14:38 ` Nicolas Dichtel
2012-09-10 17:18 ` David Miller
2012-09-10 17:59 ` Vlad Yasevich
2012-09-10 18:01 ` David Miller
2012-09-22 16:49 ` Jan Engelhardt
2012-09-07 14:51 ` [PATCH 1/2] dst: take into account policy update on check() Vlad Yasevich
2012-09-07 15:08 ` Eric Dumazet
2012-09-07 15:57 ` [PATCH 2/2] ipv6: remove rt6i_flow_cache_genid field in rt6_info Nicolas Dichtel
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