netdev - Re: v6/sit tunnels and VRFs

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Message-ID: <0f2d24f1-294a-ac82-02ee-8c22d752f399@gmail.com>
Date:   Tue, 31 Oct 2017 16:36:08 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jeff Barnhill <0xeffeff@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: v6/sit tunnels and VRFs

On 10/31/17 4:20 PM, Jeff Barnhill wrote:
> Thanks, David.  Those slides are extremely helpful.
> 
> Also, I ran into a bug that manifested on big endian architecture:
> 
> diff --git i/drivers/net/vrf.c w/drivers/net/vrf.c
> index b23bb2fae5f8..a5f984689aee 100644
> --- i/drivers/net/vrf.c
> +++ w/drivers/net/vrf.c
> @@ -1130,7 +1130,7 @@ static int vrf_fib_rule(const struct net_device
> *dev, __u8 family, bool add_it)
>         frh->family = family;
>         frh->action = FR_ACT_TO_TBL;
> 
> -       if (nla_put_u32(skb, FRA_L3MDEV, 1))
> +       if (nla_put_u8(skb, FRA_L3MDEV, 1))
>                 goto nla_put_failure;
> 
>         if (nla_put_u32(skb, FRA_PRIORITY, FIB_RULE_PREF))
> 
> I was surprised that nlmsg_parse in fib_nl_newrule() didn't pick this
> up, but I verified that the received value for this attribute was 0,
> not 1 (w/o the patch).
> 

yikes, I am surprised the fib rule policy did not catch that.

Please submit formally with:

Fixes: 1aa6c4f6b8cd8 ("net: vrf: Add l3mdev rules on first device create")