netdev - Re: [PATCH net-next v3 4/5] net/tc: introduce TC_ACT

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Date:   Wed, 25 Jul 2018 14:59:51 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Cong Wang <xiyou.wangcong@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Eyal Birger <eyal.birger@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Shmulik Ladkani <shmulik.ladkani@...il.com>
Subject: Re: [PATCH net-next v3 4/5] net/tc: introduce TC_ACT_REINJECT.

Wed, Jul 25, 2018 at 02:16:12PM CEST, jhs@...atatu.com wrote:

[...]

>> diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
>> index 2081e4219f81..36ccfe2a303a 100644
>> --- a/include/net/pkt_cls.h
>> +++ b/include/net/pkt_cls.h
>> @@ -7,6 +7,9 @@
>>   #include <net/sch_generic.h>
>>   #include <net/act_api.h>
>> +/* TC action not accessible from user space */
>> +#define TC_ACT_REINJECT		(TC_ACT_VALUE_MAX + 1)
>
>Lets say in the future we add a new opcode.
>Will old kernel, new iproute2 (new value) work?

This is safe. See patch #2.