netdev - Re: [PATCH v3 net-next 4/4] net/sched: act

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Date:   Thu, 6 Oct 2016 10:30:43 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Shmulik Ladkani <shmulik.ladkani@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v3 net-next 4/4] net/sched: act_mirred: Implement ingress actions

On Thu, Oct 6, 2016 at 6:30 AM, Shmulik Ladkani
<shmulik.ladkani@...il.com> wrote:
> Hi,
>
> On Mon, Oct 3, 2016 at 12:45 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> On Thu, Sep 29, 2016 at 4:03 AM, Shmulik Ladkani
>> <shmulik.ladkani@...il.com> wrote:
>>>         skb2->skb_iif = skb->dev->ifindex;
>>>         skb2->dev = dev;
>>> -       err = dev_queue_xmit(skb2);
>>> +       if (tcf_mirred_act_direction(m_eaction) & AT_EGRESS)
>>> +               err = dev_queue_xmit(skb2);
>>> +       else
>>> +               netif_receive_skb(skb2);
>>
>> Any reason why not check the return value here?
>
> Rationale: netif_receive_skb returns err if there was no protocol
> handler to deliver the skb to.
> If skb is not caught by any protocol handler, this should not be
> considered an "ingress redirect" error. The redirect action should be
> considered successful.

A quick grep shows there are many places returning NET_RX_DROP:
E.g.

net/ipv4/arp.c: return NET_RX_DROP;
net/ipv4/arp.c: return NET_RX_DROP;
net/ipv4/gre_demux.c:   return NET_RX_DROP;
net/ipv4/ip_forward.c:  return NET_RX_DROP;
net/ipv4/ip_input.c:    return NET_RX_DROP;
net/ipv4/ip_input.c:    return NET_RX_DROP;
net/ipv4/ipconfig.c:            return NET_RX_DROP;
net/ipv4/ipconfig.c:            return NET_RX_DROP;
net/ipv4/raw.c:         return NET_RX_DROP;
net/ipv4/raw.c:         return NET_RX_DROP;
net/ipv4/xfrm4_input.c: return NET_RX_DROP;
net/ipv6/ip6_input.c:           return NET_RX_DROP;
net/ipv6/ip6_input.c:                   return NET_RX_DROP;
net/ipv6/ip6_input.c:   return NET_RX_DROP;
net/ipv6/raw.c:         return NET_RX_DROP;
net/ipv6/raw.c:         return NET_RX_DROP;
net/ipv6/raw.c:         return NET_RX_DROP;
net/ipv6/raw.c:                 return NET_RX_DROP;