Re: [PATCH net-next v2 1/5] net: bridge: Add support for bridge port in locked mode

[Nikolay Aleksandrov]

On 09/02/2022 15:05, Hans Schultz wrote:
> In a 802.1X scenario, clients connected to a bridge port shall not
> be allowed to have traffic forwarded until fully authenticated.
> A static fdb entry of the clients MAC address for the bridge port
> unlocks the client and allows bidirectional communication.
> 
> This scenario is facilitated with setting the bridge port in locked
> mode, which is also supported by various switchcore chipsets.
> 
> Signed-off-by: Hans Schultz <schultz.hans+netdev@xxxxxxxxx>
> ---

Hi,
I'm writing from my private email because for some reason I'm not receiving the full
patch-set in my nvidia mail, a few comments below..

>  include/linux/if_bridge.h    |  1 +
>  include/uapi/linux/if_link.h |  1 +
>  net/bridge/br_input.c        | 10 +++++++++-
>  net/bridge/br_netlink.c      |  6 +++++-
>  4 files changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
> index 509e18c7e740..3aae023a9353 100644
> --- a/include/linux/if_bridge.h
> +++ b/include/linux/if_bridge.h
> @@ -58,6 +58,7 @@ struct br_ip_list {
>  #define BR_MRP_LOST_CONT	BIT(18)
>  #define BR_MRP_LOST_IN_CONT	BIT(19)
>  #define BR_TX_FWD_OFFLOAD	BIT(20)
> +#define BR_PORT_LOCKED		BIT(21)
>  
>  #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
>  
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index 6218f93f5c1a..a45cc0a1f415 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -537,6 +537,7 @@ enum {
>  	IFLA_BRPORT_MRP_IN_OPEN,
>  	IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT,
>  	IFLA_BRPORT_MCAST_EHT_HOSTS_CNT,
> +	IFLA_BRPORT_LOCKED,
>  	__IFLA_BRPORT_MAX
>  };
>  #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
> index b50382f957c1..469e3adbce07 100644
> --- a/net/bridge/br_input.c
> +++ b/net/bridge/br_input.c
> @@ -69,6 +69,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
>  	struct net_bridge_port *p = br_port_get_rcu(skb->dev);
>  	enum br_pkt_type pkt_type = BR_PKT_UNICAST;
>  	struct net_bridge_fdb_entry *dst = NULL;
> +	struct net_bridge_fdb_entry *fdb_entry;

move fdb_entry below to where it is used

>  	struct net_bridge_mcast_port *pmctx;
>  	struct net_bridge_mdb_entry *mdst;
>  	bool local_rcv, mcast_hit = false;
> @@ -81,6 +82,8 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
>  	if (!p || p->state == BR_STATE_DISABLED)
>  		goto drop;
>  
> +	br = p->br;
> +

please drop the extra new line

>  	brmctx = &p->br->multicast_ctx;
>  	pmctx = &p->multicast_ctx;
>  	state = p->state;
> @@ -88,10 +91,15 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
>  				&state, &vlan))
>  		goto out;
>  
> +	if (p->flags & BR_PORT_LOCKED) {

fdb_entry should be defined in this scope only, and please rename it to something
like fdb_src or just "src" as we already have "dst".

> +		fdb_entry = br_fdb_find_rcu(br, eth_hdr(skb)->h_source, vid);
> +		if (!(fdb_entry && fdb_entry->dst == p))

if (!fdb_entry || READ_ONCE(fdb_entry->dst) != p

> +			goto drop;
> +	}
> +
>  	nbp_switchdev_frame_mark(p, skb);
>  
>  	/* insert into forwarding database after filtering to avoid spoofing */
> -	br = p->br;
>  	if (p->flags & BR_LEARNING)
>  		br_fdb_update(br, p, eth_hdr(skb)->h_source, vid, 0);
>  
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 2ff83d84230d..7d4432ca9a20 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -184,6 +184,7 @@ static inline size_t br_port_info_size(void)
>  		+ nla_total_size(1)	/* IFLA_BRPORT_VLAN_TUNNEL */
>  		+ nla_total_size(1)	/* IFLA_BRPORT_NEIGH_SUPPRESS */
>  		+ nla_total_size(1)	/* IFLA_BRPORT_ISOLATED */
> +		+ nla_total_size(1)	/* IFLA_BRPORT_LOCKED */
>  		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_ROOT_ID */
>  		+ nla_total_size(sizeof(struct ifla_bridge_id))	/* IFLA_BRPORT_BRIDGE_ID */
>  		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_DESIGNATED_PORT */
> @@ -269,7 +270,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
>  							  BR_MRP_LOST_CONT)) ||
>  	    nla_put_u8(skb, IFLA_BRPORT_MRP_IN_OPEN,
>  		       !!(p->flags & BR_MRP_LOST_IN_CONT)) ||
> -	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
> +	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)) ||
> +	    nla_put_u8(skb, IFLA_BRPORT_LOCKED, !!(p->flags & BR_PORT_LOCKED)))
>  		return -EMSGSIZE;
>  
>  	timerval = br_timer_value(&p->message_age_timer);
> @@ -827,6 +829,7 @@ static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
>  	[IFLA_BRPORT_GROUP_FWD_MASK] = { .type = NLA_U16 },
>  	[IFLA_BRPORT_NEIGH_SUPPRESS] = { .type = NLA_U8 },
>  	[IFLA_BRPORT_ISOLATED]	= { .type = NLA_U8 },
> +	[IFLA_BRPORT_LOCKED] = { .type = NLA_U8 },
>  	[IFLA_BRPORT_BACKUP_PORT] = { .type = NLA_U32 },
>  	[IFLA_BRPORT_MCAST_EHT_HOSTS_LIMIT] = { .type = NLA_U32 },
>  };
> @@ -893,6 +896,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[],
>  	br_set_port_flag(p, tb, IFLA_BRPORT_VLAN_TUNNEL, BR_VLAN_TUNNEL);
>  	br_set_port_flag(p, tb, IFLA_BRPORT_NEIGH_SUPPRESS, BR_NEIGH_SUPPRESS);
>  	br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
> +	br_set_port_flag(p, tb, IFLA_BRPORT_LOCKED, BR_PORT_LOCKED);
>  
>  	changed_mask = old_flags ^ p->flags;
>  

Thanks,
 Nik