netdev - Re: [PATCH v3] net: Require exact match for TCP socket lookups if dif is l3mdev

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Date:   Sat, 15 Oct 2016 17:07:53 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH v3] net: Require exact match for TCP socket lookups if dif
 is l3mdev

On 10/15/16 3:46 PM, David Miller wrote:
> From: David Ahern <dsa@...ulusnetworks.com>
> Date: Fri, 14 Oct 2016 12:29:19 -0700
> 
>> +/* can not be used in TCP layer after tcp_v6_fill_cb */
>> +static inline bool inet6_exact_dif_match(struct net *net, struct sk_buff *skb)
>> +{
>> +#if defined(CONFIG_NET_L3_MASTER_DEV)
>> +	if (!net->ipv4.sysctl_tcp_l3mdev_accept &&
>> +	    skb_l3mdev_slave(IP6CB(skb)->flags))
>> +		return true;
>> +#endif
>> +	return false;
>> +}
>  ...
>> +static inline bool skb_l3mdev_slave4(u16 flags)
>> +{
>> +	return !!(flags & IPSKB_L3SLAVE);
>> +}
> 
> I think this makes the code confusing.
> 
> Actually it has been from the beginning, because we have a generically
> named "skb_l3mdev_slave()" helper which strictly operates on ipv6
> state.
> 
> Please do something with the naming of these two helpers,
> skb_l3mdev_slave() and skb_l3mdev_slave4(), so that it is clear that
> they are ipv6 and ipv4 specific helpers, respectively.
> 

I believe at netconf someone mentioned it would be a great day when something is done for IPv6 first and IPv4 was a follow on. Here you go. :-)

I can rename the existing one to skb_l3mdev_slave_6 and make the new one skb_l3mdev_slave_4.