Re: [Intel-wired-lan] [PATCH net v1] iavf: validate dest MAC and VLAN from tc-filter code path

[Michal Swiatkowski <michal.swiatkowski@linux.intel.com>]

On Fri, Jun 17, 2022 at 01:50:00PM -0400, Jun Zhang wrote:
> From: Kiran Patil <kiran.patil@intel.com>
> 
> Before allowing tc-filter using dest MAC, VLAN - check to make
> sure there is basic active filter using specified dest MAC and
> likewise for VLAN.
> 
> This check is must to allow only legit filter via tc-filter
> code path with or without ADQ.
> 
> Fixes: 0075fa0fadd0 ("i40evf: Add support to apply cloud filters")
> Signed-off-by: Kiran Patil <kiran.patil@intel.com>
> Signed-off-by: Jun Zhang <xuejun.zhang@intel.com>
> ---
>  drivers/net/ethernet/intel/iavf/iavf_main.c | 62 ++++++++++++++++++++-
>  1 file changed, 61 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
> index 57c51a15bcbc..287c3e4bf8af 100644
> --- a/drivers/net/ethernet/intel/iavf/iavf_main.c
> +++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
> @@ -3558,6 +3558,48 @@ static int __iavf_setup_tc(struct net_device *netdev, void *type_data)
>  	return ret;
>  }
>  
> +/**
> + * iavf_is_vlan_tc_filter_allowed - allowed to add tc-filter using VLAN
> + * @adapter: board private structure
> + * @vlan: VLAN to verify
> + *
> + * Using specified "vlan" ID, there must be active VLAN filter in VF's
> + * MAC-VLAN filter list.
> + */
> +static bool
> +iavf_is_vlan_tc_filter_allowed(struct iavf_adapter *adapter, u16 vlan)
> +{
> +	struct iavf_vlan_filter *f;
> +	bool allowed;
> +
> +	spin_lock_bh(&adapter->mac_vlan_list_lock);
Why do we need lock here?

> +	f = iavf_find_vlan(adapter, IAVF_VLAN(vlan, ETH_P_8021Q));
> +	allowed = (f && f->add && !f->remove);
> +	spin_unlock_bh(&adapter->mac_vlan_list_lock);
> +	return allowed;
> +}
> +
> +/**
> + * iavf_is_mac_tc_filter_allowed - allowed to add tc-filter using MAC addr
> + * @adapter: board private structure
> + * @macaddr: MAC address
> + *
> + * Using specified MAC address, there must be active MAC filter in VF's
> + * MAC-VLAN filter list.
> + */
> +static bool
> +iavf_is_mac_tc_filter_allowed(struct iavf_adapter *adapter, const u8 *macaddr)
> +{
> +	struct iavf_mac_filter *f;
> +	bool allowed;
> +
> +	spin_lock_bh(&adapter->mac_vlan_list_lock);
> +	f = iavf_find_filter(adapter, macaddr);
> +	allowed = (f && f->add && !f->is_new_mac && !f->remove);
> +	spin_unlock_bh(&adapter->mac_vlan_list_lock);
> +	return allowed;
> +}
> +
>  /**
>   * iavf_parse_cls_flower - Parse tc flower filters provided by kernel
>   * @adapter: board private structure
> @@ -3651,7 +3693,15 @@ static int iavf_parse_cls_flower(struct iavf_adapter *adapter,
>  			}
>  		}
>  
> -		if (!is_zero_ether_addr(match.key->dst))
> +		if (!is_zero_ether_addr(match.key->dst)) {
> +			if (!iavf_is_mac_tc_filter_allowed(adapter,
> +							   match.key->dst)) {
> +				dev_err(&adapter->pdev->dev,
> +					"Dest MAC %pM doesn't belong to this VF\n",
> +					match.mask->dst);
> +				return -EINVAL;
> +			}
> +
>  			if (is_valid_ether_addr(match.key->dst) ||
>  			    is_multicast_ether_addr(match.key->dst)) {
>  				/* set the mask if a valid dst_mac address */
> @@ -3660,6 +3710,7 @@ static int iavf_parse_cls_flower(struct iavf_adapter *adapter,
>  				ether_addr_copy(vf->data.tcp_spec.dst_mac,
>  						match.key->dst);
>  			}
> +		}
>  
>  		if (!is_zero_ether_addr(match.key->src))
>  			if (is_valid_ether_addr(match.key->src) ||
> @@ -3677,6 +3728,8 @@ static int iavf_parse_cls_flower(struct iavf_adapter *adapter,
>  
>  		flow_rule_match_vlan(rule, &match);
>  		if (match.mask->vlan_id) {
> +			u16 vlan = match.key->vlan_id & VLAN_VID_MASK;
> +
>  			if (match.mask->vlan_id == VLAN_VID_MASK) {
>  				field_flags |= IAVF_CLOUD_FIELD_IVLAN;
>  			} else {
> @@ -3684,6 +3737,13 @@ static int iavf_parse_cls_flower(struct iavf_adapter *adapter,
>  					match.mask->vlan_id);
>  				return -EINVAL;
>  			}
> +
> +			if (!iavf_is_vlan_tc_filter_allowed(adapter, vlan)) {
> +				dev_err(&adapter->pdev->dev,
> +					"VLAN %u doesn't belong to this VF\n",
> +					vlan);
> +				return -EINVAL;
> +			}
>  		}
>  		vf->mask.tcp_spec.vlan_id |= cpu_to_be16(0xffff);
>  		vf->data.tcp_spec.vlan_id = cpu_to_be16(match.key->vlan_id);
> -- 
> 2.35.3
> 
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