netdev - Re: [PATCH net-next 5/5] ipv6: route: dissect flow in input path if fib rules need it

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Date:   Sun, 25 Feb 2018 20:19:16 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>, davem@...emloft.net,
        netdev@...r.kernel.org
Cc:     nikolay@...ulusnetworks.com, idosch@...lanox.com
Subject: Re: [PATCH net-next 5/5] ipv6: route: dissect flow in input path if
 fib rules need it

On 2/24/18 10:44 PM, Roopa Prabhu wrote:

> @@ -1847,12 +1858,27 @@ void ip6_route_input(struct sk_buff *skb)
>  		.flowi6_mark = skb->mark,
>  		.flowi6_proto = iph->nexthdr,
>  	};
> +	struct flow_keys *flkeys = NULL, _flkeys;
>  
>  	tun_info = skb_tunnel_info(skb);
>  	if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
>  		fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
> +
> +#ifdef CONFIG_IPV6_MULTIPLE_TABLES
> +	if (net->ipv6.fib6_rules_require_fldissect) {
> +		unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
> +
> +		memset(&_flkeys, 0, sizeof(_flkeys));
> +		skb_flow_dissect_flow_keys(skb, &_flkeys, flag);
> +		fl6.fl6_sport = _flkeys.ports.src;
> +		fl6.fl6_dport = _flkeys.ports.dst;
> +		fl6.flowi6_proto = _flkeys.basic.ip_proto;
> +		flkeys = &_flkeys;
> +	}
> +#endif

same here - helper versus inline.