linux-kernel - Re: [PATCH net-next 5/6] net: udp: use kfree_skb_reason() in udp_queue_rcv_one

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Message-ID: <CADxym3aFJcsz=fckaFx9SJh8B7=0Xv-EPz79bbUFW1wG_zNYbw@mail.gmail.com>
Date:   Wed, 26 Jan 2022 10:43:42 +0800
From:   Menglong Dong <menglong8.dong@...il.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>, mingo@...hat.com,
        David Miller <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>, pablo@...filter.org,
        kadlec@...filter.org, Florian Westphal <fw@...len.de>,
        Menglong Dong <imagedong@...cent.com>,
        Eric Dumazet <edumazet@...gle.com>, alobakin@...me,
        paulb@...dia.com, Paolo Abeni <pabeni@...hat.com>,
        talalahmad@...gle.com, haokexin@...il.com,
        Kees Cook <keescook@...omium.org>, memxor@...il.com,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, netfilter-devel@...r.kernel.org,
        coreteam@...filter.org, Cong Wang <cong.wang@...edance.com>
Subject: Re: [PATCH net-next 5/6] net: udp: use kfree_skb_reason() in udp_queue_rcv_one_skb()

On Wed, Jan 26, 2022 at 10:25 AM David Ahern <dsahern@...il.com> wrote:
>
> On 1/24/22 6:15 AM, menglong8.dong@...il.com wrote:
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 603f77ef2170..dd64a4f2ff1d 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -330,6 +330,7 @@ enum skb_drop_reason {
> >       SKB_DROP_REASON_UNICAST_IN_L2_MULTICAST,
> >       SKB_DROP_REASON_XFRM_POLICY,
> >       SKB_DROP_REASON_IP_NOPROTO,
> > +     SKB_DROP_REASON_UDP_FILTER,
>
> Is there really a need for a UDP and TCP version? why not just:
>
>         /* dropped due to bpf filter on socket */
>         SKB_DROP_REASON_SOCKET_FILTER
>

I realized it, but SKB_DROP_REASON_TCP_FILTER was already
introduced before. Besides, I think maybe
a SKB_DROP_REASON_L4_CSUM is enough for UDP/TCP/ICMP
checksum error?

> >       SKB_DROP_REASON_MAX,
> >  };
> >
>