netdev - Re: [PATCH net v2 2/2] vxlan: support ndo_fill_metadata

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Message-Id: <20151204.142838.797312333399556109.davem@davemloft.net>
Date:	Fri, 04 Dec 2015 14:28:38 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	pshelar@...ira.com
Cc:	jbenc@...hat.com, netdev@...r.kernel.org, jesse@...ira.com
Subject: Re: [PATCH net v2 2/2] vxlan: support ndo_fill_metadata_dst also
 for IPv6

From: Pravin Shelar <pshelar@...ira.com>
Date: Fri, 4 Dec 2015 10:49:37 -0800

> On Thu, Dec 3, 2015 at 2:41 AM, Jiri Benc <jbenc@...hat.com> wrote:
>> Fill the metadata correctly even when tunneling over IPv6. Also, check that
>> the provided metadata is of an address family that is supported by the
>> tunnel.
>>
>> Signed-off-by: Jiri Benc <jbenc@...hat.com>
>> ---
>> v2: fixed unused variable warning when building without IPv6
>> ---
>>  drivers/net/vxlan.c | 26 ++++++++++++++++++++++++--
>>  1 file changed, 24 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
>> index 5a38558da157..d3594de3ad07 100644
>> --- a/drivers/net/vxlan.c
>> +++ b/drivers/net/vxlan.c
>> @@ -2413,15 +2413,37 @@ static int vxlan_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
>>  {
>>         struct vxlan_dev *vxlan = netdev_priv(dev);
>>         struct ip_tunnel_info *info = skb_tunnel_info(skb);
>> +#if IS_ENABLED(CONFIG_IPV6)
>> +       struct dst_entry *ndst;
>> +#endif
>>         __be16 sport, dport;
>>
>>         sport = udp_flow_src_port(dev_net(dev), skb, vxlan->cfg.port_min,
>>                                   vxlan->cfg.port_max, true);
>>         dport = info->key.tp_dst ? : vxlan->cfg.dst_port;
>>
>> -       if (ip_tunnel_info_af(info) == AF_INET)
>> +       if (ip_tunnel_info_af(info) == AF_INET) {
>> +               if (!vxlan->vn4_sock)
>> +                       return -EINVAL;
>>                 return egress_ipv4_tun_info(dev, skb, info, sport, dport);
>> -       return -EINVAL;
>> +       } else {
>> +               if (!IS_ENABLED(CONFIG_IPV6))
>> +                       return -EPFNOSUPPORT;
>> +
>> +#if IS_ENABLED(CONFIG_IPV6)
>> +               if (!vxlan->vn6_sock)
>> +                       return -EINVAL;
>> +               ndst = vxlan6_get_route(vxlan, skb, 0,
>> +                                       &info->key.u.ipv6.dst,
>> +                                       &info->key.u.ipv6.src);
>> +               if (IS_ERR(ndst))
>> +                       return PTR_ERR(ndst);
>> +               dst_release(ndst);
>> +#endif
> 
> Rather than checking IS_ENABLED(CONFIG_IPV6) three separate times, all
> code can is restructured in one #if #else block by moving the ndst
> definition to IPv6 local block.

Agreed, you should be putting variable definitions into the deepest most
containing scope anyways.  So if you declare 'ndst' inside of the else
branch you'll be doing that plus decreasing the amount of CPP tests in
this file.
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