netdev - Re: [PATCH net-next 1/1] net sched qdisc: pass netlink message flags in event notification

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAM_iQpXm8CevNhWQV-MAP1FmN1aTy4m1tknviMphk-mR=t1=7Q@mail.gmail.com>
Date:   Mon, 30 Oct 2017 09:23:12 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Roman Mashak <mrv@...atatu.com>
Cc:     David Miller <davem@...emloft.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH net-next 1/1] net sched qdisc: pass netlink message flags
 in event notification

On Sat, Oct 28, 2017 at 8:36 PM, Roman Mashak <mrv@...atatu.com> wrote:
> Cong Wang <xiyou.wangcong@...il.com> writes:
>
>> On Thu, Oct 26, 2017 at 2:40 PM, Roman Mashak <mrv@...atatu.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
>>> qdisc operations.
>>>
>>> Signed-off-by: Roman Mashak <mrv@...atatu.com>
>>> ---
>>>  net/sched/sch_api.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
>>> index a9ac912..e3e29be 100644
>>> --- a/net/sched/sch_api.c
>>> +++ b/net/sched/sch_api.c
>>> @@ -859,7 +859,7 @@ static int qdisc_notify(struct net *net, struct sk_buff *oskb,
>>>         }
>>>         if (new && !tc_qdisc_dump_ignore(new, false)) {
>>>                 if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
>>> -                                 old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
>>> +                                 n->nlmsg_flags, RTM_NEWQDISC) < 0)
>>
>>
>> Don't you want to change the other tc_fill_qdisc() in the same function
>> too? ;)
>
> The other tc_fill_qdisc generates RTM_DELQDISC event, in that case
> netlink flags for user don't matter.

Hmm, I thought you use RTM_NEWQDISC+RTM_DELQDISC to
determine it is replacement, no?