From: Roman Mashak <mrv@mojatatu•com>
To: Daniel Borkmann <daniel@iogearbox•net>
Cc: Cong Wang <xiyou.wangcong@gmail•com>,
David Miller <davem@davemloft•net>,
Linux Kernel Network Developers <netdev@vger•kernel.org>,
Jamal Hadi Salim <jhs@mojatatu•com>
Subject: Re: [PATCH net 1/1] net sched filters: pass netlink message flags in event notification
Date: Tue, 22 Nov 2016 11:02:51 -0500 [thread overview]
Message-ID: <85mvgrbiz8.fsf@mojatatu.com> (raw)
In-Reply-To: <58340FA2.7040006@iogearbox.net> (Daniel Borkmann's message of "Tue, 22 Nov 2016 10:28:02 +0100")
Daniel Borkmann <daniel@iogearbox•net> writes:
> On 11/22/2016 06:23 AM, Cong Wang wrote:
>> On Thu, Nov 17, 2016 at 1:02 PM, Cong Wang <xiyou.wangcong@gmail•com> wrote:
>>> On Wed, Nov 16, 2016 at 2:16 PM, Roman Mashak <mrv@mojatatu•com> wrote:
>>>> Userland client should be able to read an event, and reflect it back to
>>>> the kernel, therefore it needs to extract complete set of netlink flags.
>>>>
>>>> For example, this will allow "tc monitor" to distinguish Add and Replace
>>>> operations.
>>>>
>>>> Signed-off-by: Roman Mashak <mrv@mojatatu•com>
>>>> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu•com>
>>>> ---
>>>> net/sched/cls_api.c | 5 +++--
>>>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
>>>> index 2b2a797..8e93d4a 100644
>>>> --- a/net/sched/cls_api.c
>>>> +++ b/net/sched/cls_api.c
>>>> @@ -112,7 +112,7 @@ static void tfilter_notify_chain(struct net *net, struct sk_buff *oskb,
>>>>
>>>> for (it_chain = chain; (tp = rtnl_dereference(*it_chain)) != NULL;
>>>> it_chain = &tp->next)
>>>> - tfilter_notify(net, oskb, n, tp, 0, event, false);
>>>> + tfilter_notify(net, oskb, n, tp, n->nlmsg_flags, event, false);
>>>
>>>
>>> I must miss something, why does it make sense to pass n->nlmsg_flags
>>> as 'fh' to tfilter_notify()??
>>
>> Ping... Any response?
>>
>> It still doesn't look correct to me. I will send a fix unless someone could
>> explain this.
>
> Sigh, I missed that this was applied already to -net (it certainly doesn't look
> like -net material, but rather -net-next stuff) ... This definitely looks buggy
> to me, the 0 as it was before was correct here (as it means we delete the whole
> chain in this case).
>
> If you could send a patch would be great. Thanks Cong!
Cong/Daniel, sorry for late response, I was distracted.
I apologize, I will send a fix today.
--
Roman Mashak
prev parent reply other threads:[~2016-11-22 16:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-16 22:16 [PATCH net 1/1] net sched filters: pass netlink message flags in event notification Roman Mashak
2016-11-17 18:42 ` David Miller
2016-11-17 21:02 ` Cong Wang
2016-11-22 5:23 ` Cong Wang
2016-11-22 9:28 ` Daniel Borkmann
2016-11-22 16:02 ` Roman Mashak [this message]
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