From: "Yang, Yi" <yi.y.yang@intel.com>
To: Pravin Shelar <pshelar@ovn.org>
Cc: Jiri Benc <jbenc@redhat.com>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
ovs dev <dev@openvswitch.org>, Eric Garver <e@erig.me>,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH net-next v15] openvswitch: enable NSH support
Date: Tue, 7 Nov 2017 19:28:34 +0800 [thread overview]
Message-ID: <20171107112833.GA56179@cran64.bj.intel.com> (raw)
In-Reply-To: <CAOrHB_CnXbGJjCT+-_KLi7C0XN9BK8QvRdTpgbzBj7xGeHbL7w@mail.gmail.com>
On Tue, Nov 07, 2017 at 06:57:30PM +0800, Pravin Shelar wrote:
> On Mon, Nov 6, 2017 at 4:22 AM, Jiri Benc <jbenc@redhat.com> wrote:
> > On Sat, 4 Nov 2017 07:29:46 -0700, Pravin Shelar wrote:
> >> > +int nsh_push(struct sk_buff *skb, const struct nshhdr *pushed_nh)
> >> > +{
> >> > + struct nshhdr *nh;
> >> > + size_t length = nsh_hdr_len(pushed_nh);
> >> > + u8 next_proto;
> >> > +
> >> > + if (skb->mac_len) {
> >> > + next_proto = TUN_P_ETHERNET;
> >> > + } else {
> >> > + next_proto = tun_p_from_eth_p(skb->protocol);
> >> > + if (!next_proto)
> >> > + return -EAFNOSUPPORT;
> >> check for supported protocols can be moved to flow install validation
> >> in __ovs_nla_copy_actions().
> >
> > You mean the check for !next_proto? It needs to be present for
> > correctness of nsh_push. This function has to be self contained, it
> > will be used by more callers than opevswitch, namely tc.
> >
> > It's actually not so much a check for "supported protocols", it's
> > rather a check of return value of a function that converts ethertype to
> > a 1 byte tunnel type. Blindly using a result of a function that may
> > return error would be wrong. Openvswitch is free to perform additional
> > checks but this needs to stay.
> >
> I am not disputing validity of the checks, but it could be done at
> flow install phase.
> For other use case we could refactor code. If it is too complex, I am
> fine with duplicate code that check the protocol in flow install for
> now.
Ok, I'll add check code in __ovs_nla_copy_actions for both nsh_push and
nsh_pop, but how can we get value of skb->protocol in
__ovs_nla_copy_actions? Is it argument eth_type of
__ovs_nla_copy_actions?
>
> >> > +int nsh_pop(struct sk_buff *skb)
> >> > +{
> >> > + struct nshhdr *nh;
> >> > + size_t length;
> >> > + __be16 inner_proto;
> >> > +
> >> > + if (!pskb_may_pull(skb, NSH_BASE_HDR_LEN))
> >> > + return -ENOMEM;
> >> > + nh = (struct nshhdr *)(skb->data);
> >> > + length = nsh_hdr_len(nh);
> >> > + inner_proto = tun_p_to_eth_p(nh->np);
> >> same as above, this check can be moved to flow install __ovs_nla_copy_actions().
> >
> > There's no check here.
> >
> >> > + if (!pskb_may_pull(skb, length))
> >> > + return -ENOMEM;
> >> > +
> >> > + if (!inner_proto)
> >> > + return -EAFNOSUPPORT;
> >
> > Did you mean this one instead? Then see above, this has to stay.
> >
> > Jiri
next prev parent reply other threads:[~2017-11-07 11:44 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-01 4:03 [PATCH net-next v15] openvswitch: enable NSH support Yi Yang
2017-11-01 8:46 ` Jiri Benc
2017-11-01 15:21 ` Eric Garver
2017-11-02 0:52 ` Pravin Shelar
2017-11-02 2:50 ` Yang, Yi
2017-11-02 12:06 ` Pravin Shelar
[not found] ` <CAOrHB_BaUS7WfisvX6G+450tEQ2skmsE0v-b27s-_21s25bigw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-02 12:09 ` Yang, Yi
2017-11-03 1:40 ` Yang, Yi
2017-11-04 12:30 ` Pravin Shelar
[not found] ` <1509508981-66202-1-git-send-email-yi.y.yang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-11-04 14:29 ` Pravin Shelar
2017-11-06 4:19 ` Yang, Yi
2017-11-06 12:09 ` Pravin Shelar
[not found] ` <CAOrHB_COGWb78kN70QFKgA3w5v3zasAW=TJbzoE5zZYKao_GvA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-06 12:22 ` Jiri Benc
[not found] ` <20171106132248.6fa4c5a0-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-11-07 10:57 ` Pravin Shelar
2017-11-07 11:28 ` Yang, Yi [this message]
[not found] ` <20171107112833.GA56179-re2EX8HDrk21gSHoDXDV2kEOCMrvLtNR@public.gmane.org>
2017-11-07 11:58 ` Pravin Shelar
[not found] ` <CAOrHB_D2khYGGJxNA8hpE4Qnhm7ONKrH=kcNteV=iYWLRnaGHQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-11-07 11:55 ` Yang, Yi
2017-11-07 13:01 ` Pravin Shelar
2017-11-07 13:09 ` Yang, Yi
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