netdev - Re: [PATCH net] net: mscc: ocelot: properly reject destination IP keys in VCAP IS1

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Date:   Thu, 4 Mar 2021 10:31:04 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH net] net: mscc: ocelot: properly reject destination IP
 keys in VCAP IS1

On 04/03/2021 10:29, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@....com>
> 
> An attempt is made to warn the user about the fact that VCAP IS1 cannot
> offload keys matching on destination IP (at least given the current half
> key format), but sadly that warning fails miserably in practice, due to
> the fact that it operates on an uninitialized "match" variable. We must
> first decode the keys from the flow rule.
> 
> Fixes: 75944fda1dfe ("net: mscc: ocelot: offload ingress skbedit and vlan actions to VCAP IS1")
> Reported-by: Colin Ian King <colin.king@...onical.com>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
>  drivers/net/ethernet/mscc/ocelot_flower.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mscc/ocelot_flower.c b/drivers/net/ethernet/mscc/ocelot_flower.c
> index c3ac026f6aea..a41b458b1b3e 100644
> --- a/drivers/net/ethernet/mscc/ocelot_flower.c
> +++ b/drivers/net/ethernet/mscc/ocelot_flower.c
> @@ -540,13 +540,14 @@ ocelot_flower_parse_key(struct ocelot *ocelot, int port, bool ingress,
>  			return -EOPNOTSUPP;
>  		}
>  
> +		flow_rule_match_ipv4_addrs(rule, &match);
> +
>  		if (filter->block_id == VCAP_IS1 && *(u32 *)&match.mask->dst) {
>  			NL_SET_ERR_MSG_MOD(extack,
>  					   "Key type S1_NORMAL cannot match on destination IP");
>  			return -EOPNOTSUPP;
>  		}
>  
> -		flow_rule_match_ipv4_addrs(rule, &match);
>  		tmp = &filter->key.ipv4.sip.value.addr[0];
>  		memcpy(tmp, &match.key->src, 4);
>  
> 

Thanks, looks good to me.

Reviewed-by: Colin Ian King <colin.king@...onical.com>