On Mon, Feb 07, 2022 at 11:07:39AM +0100, 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>
> ---
> 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..8fa2648fbc83 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -532,6 +532,7 @@ enum {
> IFLA_BRPORT_GROUP_FWD_MASK,
> IFLA_BRPORT_NEIGH_SUPPRESS,
> IFLA_BRPORT_ISOLATED,
> + IFLA_BRPORT_LOCKED,
Please add it at the end to avoid breaking uAPI
> IFLA_BRPORT_BACKUP_PORT,
> IFLA_BRPORT_MRP_RING_OPEN,
> IFLA_BRPORT_MRP_IN_OPEN,
> 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;
> 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;
> +
> 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 = br_fdb_find_rcu(br, eth_hdr(skb)->h_source, vid);
> + if (!(fdb_entry && fdb_entry->dst == p))
> + goto drop;
I'm not familiar with 802.1X so I have some questions:
1. Do we need to differentiate between no FDB entry and an FDB entry
pointing to a different port than we expect?
2. Does user space care about SAs that did not pass the check? That is,
does it need to see notifications? Counters?
> + }
> +
> 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;
>
> --
> 2.30.2
>
