netdev - Re: [PATCH] vxlan: using AF_PACKET socket to send multicast packet cause WARNING

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Message-ID: <CADvbK_dK_fBB3bQSWKkAk6adtgrHm553Hr3JGHsw67qeS0cQOw@mail.gmail.com>
Date:	Wed, 2 Apr 2014 13:31:59 +0800
From:	lucien xin <lucien.xin@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	network dev <netdev@...r.kernel.org>
Subject: Re: [PATCH] vxlan: using AF_PACKET socket to send multicast packet
 cause WARNING

On Wed, Apr 2, 2014 at 4:10 AM, David Miller <davem@...emloft.net> wrote:
> This is not the correct fix.
>
> If vxlan is going to reinject dev_hard_start_xmit() bound packets into
> the ipv4 stack, it must make sure that they are well formed.
>
> The SKB traversing the ipv4 stack must either be bound to an ipv4/ipv6
> socket or be orphaned.

yeah,  it's right. then I want to bound skb to vxlan's sock in
vxlan_xmit_skb(), like this:

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 1236812..8fd7e93 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1755,6 +1755,8 @@ int vxlan_xmit_skb(struct vxlan_sock *vs,
        if (err)
                return err;

+       skb_set_owner_w(skb, vs->sock->sk);
+
        return iptunnel_xmit(rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df,
                             false);
 }

which can not only solve the issue, but also make the logic more correct.
David, how do you think?
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