netdev - Re: [PATCH net-next] route: allow to route in a peer netns via lwt framework

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Message-ID: <55B1077F.1090501@6wind.com>
Date:	Thu, 23 Jul 2015 17:25:51 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	roopa <roopa@...ulusnetworks.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org, tgraf@...g.ch
Subject: Re: [PATCH net-next] route: allow to route in a peer netns via lwt
 framework

Le 23/07/2015 17:01, roopa a écrit :
> On 7/23/15, 7:22 AM, Nicolas Dichtel wrote:
[snip]
>> +static inline u32 *lwt_netns_info(struct lwtunnel_state *lwtstate)
>> +{
>> +    return (u32 *)lwtstate->data;
>> +}
>> +
>> +static inline int skb_lwt_netns_info(struct sk_buff *skb)
>> +{
>> +    if (skb->protocol == htons(ETH_P_IP)) {
>> +        struct rtable *rt = (struct rtable *)skb_dst(skb);
>> +
>> +        if (rt && rt->rt_lwtstate)
>> +            return *lwt_netns_info(rt->rt_lwtstate);
>> +    } else if (skb->protocol == htons(ETH_P_IPV6)) {
>> +        struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
>> +
>> +        if (rt6 && rt6->rt6i_lwtstate)
>> +            return *lwt_netns_info(rt6->rt6i_lwtstate);
>> +    }
>> +
>> +    return NETNSA_NSID_NOT_ASSIGNED;
>> +}
>>   #endif /* __NET_LWTUNNEL_H */
> since these apis' don't have to be netns specific,
> Can they just be named lwtunnel_get_state_data and skb_lwtunnel_state ?
They are specific to netns because lwtstate->data is interpreted as an u32 *.
But I agree that a test is missing against lwtstate->type to ensure that data
will be a nsid.

>
> and seems like they should be declared for both CONFIG_LWTUNNEL 'y' and 'n'.
It is outside the "#ifdef CONFIG_LWTUNNEL". I can successfully compile with and
without CONFIG_LWTUNNEL.

Thank you,
Nicolas
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