netdev - Re: [PATCH 2/7] mark root hnode explicitly

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Date:   Thu, 6 Sep 2018 07:04:34 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     netdev@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH 2/7] mark root hnode explicitly

On 2018-09-06 6:59 a.m., Al Viro wrote:
> On Thu, Sep 06, 2018 at 06:34:00AM -0400, Jamal Hadi Salim wrote:
>> On 2018-09-06 6:28 a.m., Jamal Hadi Salim wrote:

[..]

> Point, and that one is IMO enough to give up on using ->flags for
> that.  How about simply
> 
> diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
> index 3f985f29ef30..d14048e38b5c 100644
> --- a/net/sched/cls_u32.c
> +++ b/net/sched/cls_u32.c
> @@ -84,6 +84,7 @@ struct tc_u_hnode {
>   	int			refcnt;
>   	unsigned int		divisor;
>   	struct idr		handle_idr;
> +	bool			is_root;
>   	struct rcu_head		rcu;
>   	u32			flags;
>   	/* The 'ht' field MUST be the last field in structure to allow for
> @@ -377,6 +378,7 @@ static int u32_init(struct tcf_proto *tp)
>   	root_ht->refcnt++;
>   	root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000;
>   	root_ht->prio = tp->prio;
> +	root_ht->is_root = true;
>   	idr_init(&root_ht->handle_idr);
>   
>   	if (tp_c == NULL) {
> @@ -693,7 +695,7 @@ static int u32_delete(struct tcf_proto *tp, void *arg, bool *last,
>   		goto out;
>   	}
>   
> -	if (root_ht == ht) {
> +	if (ht->is_root) {
>   		NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node");
>   		return -EINVAL;
>   	}
> @@ -795,6 +797,10 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp,
>   				NL_SET_ERR_MSG_MOD(extack, "Link hash table not found");
>   				return -EINVAL;
>   			}
> +			if (ht_down->is_root) {
> +				NL_SET_ERR_MSG_MOD(extack, "Not linking to root node");
> +				return -EINVAL;
> +			}
>   			ht_down->refcnt++;


Looks good to me ;->

cheers,
jamal