netdev - Re: [PATCH nf] netfilter: Update ip6_route_me

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Date:   Wed, 13 Apr 2022 09:37:33 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Martin Willi <martin@...ongswan.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>
Cc:     netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH nf] netfilter: Update ip6_route_me_harder to consider L3
 domain

On 4/13/22 3:05 AM, Martin Willi wrote:
> Hi David,
> 
>>> @@ -39,6 +38,13 @@ int ip6_route_me_harder(struct net *net, struct
>>> sock *sk_partial, struct sk_buff
>>>  	};
>>>  	int err;
>>>  
>>> +	if (sk && sk->sk_bound_dev_if)
>>> +		fl6.flowi6_oif = sk->sk_bound_dev_if;
>>> +	else if (strict)
>>> +		fl6.flowi6_oif = dev->ifindex;
>>> +	else
>>> +		fl6.flowi6_oif = l3mdev_master_ifindex(dev);
>>
>> For top of tree, this is now fl6.flowi6_l3mdev
> 
> Ah, I see, missed that.
> 
> Given that IPv4 should be converted to flowi4_l3mdev as well (?), what
> about:
> 
>  * Keep the IPv6 patch in this form, as this allows stable to pick it
>    up as-is
>  * I'll add a follow-up patch, which converts both to flowi[46]_l3mdev

sure, backport to stable will be easier.

> 
> This would avoid some noise for a separate stable patch, but let me
> know what you prefer.
> 
>>  and dev is only needed here so make this:
>> 	fl6.flowi6_l3mdev = l3mdev_master_ifindex(skb_dst(skb)->dev);
> 
> Actually it is used in that "strict" branch, this is why I've added
> "dev" as a local variable. I guess that is still needed
> with flowi6_l3mdev?

ah, missed the strict branch use.