netdev - Re: [patch net-next 07/17] ipv6: fib: Add in-kernel notifications for route add / delete

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Date:   Wed, 19 Jul 2017 09:38:11 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, idosch@...lanox.com, mlxsw@...lanox.com,
        roopa@...ulusnetworks.com, nikolay@...ulusnetworks.com,
        kafai@...com, hannes@...essinduktion.org, yoshfuji@...ux-ipv6.org,
        edumazet@...gle.com, yanhaishuang@...s.chinamobile.com
Subject: Re: [patch net-next 07/17] ipv6: fib: Add in-kernel notifications for
 route add / delete

On 7/19/17 1:02 AM, Jiri Pirko wrote:
> @@ -879,6 +891,8 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
>  		*ins = rt;
>  		rt->rt6i_node = fn;
>  		atomic_inc(&rt->rt6i_ref);
> +		call_fib6_entry_notifiers(info->nl_net, FIB_EVENT_ENTRY_ADD,
> +					  rt);
>  		if (!info->skip_notify)
>  			inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
>  		info->nl_net->ipv6.rt6_stats->fib_rt_entries++;
> @@ -906,6 +920,8 @@ static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt,
>  		rt->rt6i_node = fn;
>  		rt->dst.rt6_next = iter->dst.rt6_next;
>  		atomic_inc(&rt->rt6i_ref);
> +		call_fib6_entry_notifiers(info->nl_net, FIB_EVENT_ENTRY_REPLACE,
> +					  rt);
>  		if (!info->skip_notify)
>  			inet6_rt_notify(RTM_NEWROUTE, rt, info, NLM_F_REPLACE);
>  		if (!(fn->fn_flags & RTN_RTINFO)) {
> @@ -1459,6 +1475,7 @@ static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp,
>  
>  	fib6_purge_rt(rt, fn, net);
>  
> +	call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, rt);
>  	if (!info->skip_notify)
>  		inet6_rt_notify(RTM_DELROUTE, rt, info, 0);
>  	rt6_release(rt);
> 


Why aren't all of the notifier calls under the skip_notify? That flag is
used to make handling of ipv6 multipath routes on par with ipv4. See
commit 3b1137fe74829