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

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

[Hans Schultz]

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@gmail.com>
---
 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;
 	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;
+	}
+
 	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

[Bridge] [PATCH net-next v2 2/5] net: bridge: Add support for offloading of locked port flag

[Hans Schultz]

Various switchcores support setting ports in locked mode, so that
clients behind locked ports cannot send traffic through the port
unless a fdb entry is added with the clients MAC address.

Signed-off-by: Hans Schultz <schultz.hans+netdev@gmail.com>
---
 net/bridge/br_switchdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
index f8fbaaa7c501..bf549fc22556 100644
--- a/net/bridge/br_switchdev.c
+++ b/net/bridge/br_switchdev.c
@@ -72,7 +72,7 @@ bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
 
 /* Flags that can be offloaded to hardware */
 #define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | \
-				  BR_MCAST_FLOOD | BR_BCAST_FLOOD)
+				  BR_MCAST_FLOOD | BR_BCAST_FLOOD | BR_PORT_LOCKED)
 
 int br_switchdev_set_port_flag(struct net_bridge_port *p,
 			       unsigned long flags,
-- 
2.30.2

[Bridge] [PATCH net-next v2 5/5] net: bridge: Refactor bridge port in locked mode to use jump labels

[Hans Schultz]

From: Hans Schultz <schultz.hans+lkml@gmail.com>

As the locked mode feature is in the hot path of the bridge modules
reception of packets, it needs to be refactored to use jump labels
for optimization.

Signed-off-by: Hans Schultz <schultz.hans+lkml@gmail.com>
Signed-off-by: Hans Schultz <schultz.hans+netdev@gmail.com>
---
 net/bridge/br_input.c   | 22 ++++++++++++++++++----
 net/bridge/br_netlink.c |  6 ++++++
 net/bridge/br_private.h |  2 ++
 3 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 469e3adbce07..6fc428d6bac5 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -23,6 +23,18 @@
 #include "br_private.h"
 #include "br_private_tunnel.h"
 
+static struct static_key_false br_input_locked_port_feature;
+
+void br_input_locked_port_add(void)
+{
+	static_branch_inc(&br_input_locked_port_feature);
+}
+
+void br_input_locked_port_remove(void)
+{
+	static_branch_dec(&br_input_locked_port_feature);
+}
+
 static int
 br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb)
 {
@@ -91,10 +103,12 @@ 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;
+	if (static_branch_unlikely(&br_input_locked_port_feature)) {
+		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;
+		}
 	}
 
 	nbp_switchdev_frame_mark(p, skb);
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 7d4432ca9a20..e3dbe9fed75c 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -860,6 +860,7 @@ static int br_set_port_state(struct net_bridge_port *p, u8 state)
 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 			     int attrtype, unsigned long mask)
 {
+	bool locked = p->flags & BR_PORT_LOCKED;
 	if (!tb[attrtype])
 		return;
 
@@ -867,6 +868,11 @@ static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 		p->flags |= mask;
 	else
 		p->flags &= ~mask;
+
+	if ((p->flags & BR_PORT_LOCKED) && !locked)
+		br_input_locked_port_add();
+	if (!(p->flags & BR_PORT_LOCKED) && locked)
+		br_input_locked_port_remove();
 }
 
 /* Process bridge protocol info on port */
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 2661dda1a92b..0ec3ef897978 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -832,6 +832,8 @@ void br_manage_promisc(struct net_bridge *br);
 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
 
 /* br_input.c */
+void br_input_locked_port_add(void);
+void br_input_locked_port_remove(void);
 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
 
-- 
2.30.2

Re: [Bridge] [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@gmail.com>
> ---

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

Re: [Bridge] [PATCH net-next v2 2/5] net: bridge: Add support for offloading of locked port flag

[Nikolay Aleksandrov]

On 09/02/2022 15:05, Hans Schultz wrote:
> Various switchcores support setting ports in locked mode, so that
> clients behind locked ports cannot send traffic through the port
> unless a fdb entry is added with the clients MAC address.
> 
> Signed-off-by: Hans Schultz <schultz.hans+netdev@gmail.com>
> ---
>  net/bridge/br_switchdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bridge/br_switchdev.c b/net/bridge/br_switchdev.c
> index f8fbaaa7c501..bf549fc22556 100644
> --- a/net/bridge/br_switchdev.c
> +++ b/net/bridge/br_switchdev.c
> @@ -72,7 +72,7 @@ bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
>  
>  /* Flags that can be offloaded to hardware */
>  #define BR_PORT_FLAGS_HW_OFFLOAD (BR_LEARNING | BR_FLOOD | \
> -				  BR_MCAST_FLOOD | BR_BCAST_FLOOD)
> +				  BR_MCAST_FLOOD | BR_BCAST_FLOOD | BR_PORT_LOCKED)
>  
>  int br_switchdev_set_port_flag(struct net_bridge_port *p,
>  			       unsigned long flags,

Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>

Re: [Bridge] [PATCH net-next v2 5/5] net: bridge: Refactor bridge port in locked mode to use jump labels

[Nikolay Aleksandrov]

On 09/02/2022 15:05, Hans Schultz wrote:
> From: Hans Schultz <schultz.hans+lkml@gmail.com>
> 
> As the locked mode feature is in the hot path of the bridge modules
> reception of packets, it needs to be refactored to use jump labels
> for optimization.
> 
> Signed-off-by: Hans Schultz <schultz.hans+lkml@gmail.com>
> Signed-off-by: Hans Schultz <schultz.hans+netdev@gmail.com>
> ---

Why two (almost) identical sign-offs?

Also, as Ido mentioned, please fold this patch into patch 01.

>  net/bridge/br_input.c   | 22 ++++++++++++++++++----
>  net/bridge/br_netlink.c |  6 ++++++
>  net/bridge/br_private.h |  2 ++
>  3 files changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
> index 469e3adbce07..6fc428d6bac5 100644
> --- a/net/bridge/br_input.c
> +++ b/net/bridge/br_input.c
> @@ -23,6 +23,18 @@
>  #include "br_private.h"
>  #include "br_private_tunnel.h"
>  
> +static struct static_key_false br_input_locked_port_feature;
> +
> +void br_input_locked_port_add(void)
> +{
> +	static_branch_inc(&br_input_locked_port_feature);
> +}
> +
> +void br_input_locked_port_remove(void)
> +{
> +	static_branch_dec(&br_input_locked_port_feature);
> +}
> +
>  static int
>  br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb)
>  {
> @@ -91,10 +103,12 @@ 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;
> +	if (static_branch_unlikely(&br_input_locked_port_feature)) {
> +		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;
> +		}
>  	}
>  
>  	nbp_switchdev_frame_mark(p, skb);
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 7d4432ca9a20..e3dbe9fed75c 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -860,6 +860,7 @@ static int br_set_port_state(struct net_bridge_port *p, u8 state)
>  static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
>  			     int attrtype, unsigned long mask)
>  {
> +	bool locked = p->flags & BR_PORT_LOCKED;
>  	if (!tb[attrtype])
>  		return;
>  
> @@ -867,6 +868,11 @@ static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
>  		p->flags |= mask;
>  	else
>  		p->flags &= ~mask;
> +
> +	if ((p->flags & BR_PORT_LOCKED) && !locked)
> +		br_input_locked_port_add();
> +	if (!(p->flags & BR_PORT_LOCKED) && locked)
> +		br_input_locked_port_remove();
>  }
>  
>  /* Process bridge protocol info on port */
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 2661dda1a92b..0ec3ef897978 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -832,6 +832,8 @@ void br_manage_promisc(struct net_bridge *br);
>  int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
>  
>  /* br_input.c */
> +void br_input_locked_port_add(void);
> +void br_input_locked_port_remove(void);
>  int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
>  rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
>  

Re: [Bridge] [PATCH net-next v2 5/5] net: bridge: Refactor bridge port in locked mode to use jump labels

[Hans Schultz]

On tor, feb 10, 2022 at 10:31, Nikolay Aleksandrov <razor@blackwall.org> wrote:
> On 09/02/2022 15:05, Hans Schultz wrote:
>> From: Hans Schultz <schultz.hans+lkml@gmail.com>
>> 
>> As the locked mode feature is in the hot path of the bridge modules
>> reception of packets, it needs to be refactored to use jump labels
>> for optimization.
>> 
>> Signed-off-by: Hans Schultz <schultz.hans+lkml@gmail.com>
>> Signed-off-by: Hans Schultz <schultz.hans+netdev@gmail.com>
>> ---
>
> Why two (almost) identical sign-offs?

Ups, a mistake...

>
> Also, as Ido mentioned, please fold this patch into patch 01.
>
>>  net/bridge/br_input.c   | 22 ++++++++++++++++++----
>>  net/bridge/br_netlink.c |  6 ++++++
>>  net/bridge/br_private.h |  2 ++
>>  3 files changed, 26 insertions(+), 4 deletions(-)
>> 
>> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
>> index 469e3adbce07..6fc428d6bac5 100644
>> --- a/net/bridge/br_input.c
>> +++ b/net/bridge/br_input.c
>> @@ -23,6 +23,18 @@
>>  #include "br_private.h"
>>  #include "br_private_tunnel.h"
>>  
>> +static struct static_key_false br_input_locked_port_feature;
>> +
>> +void br_input_locked_port_add(void)
>> +{
>> +	static_branch_inc(&br_input_locked_port_feature);
>> +}
>> +
>> +void br_input_locked_port_remove(void)
>> +{
>> +	static_branch_dec(&br_input_locked_port_feature);
>> +}
>> +
>>  static int
>>  br_netif_receive_skb(struct net *net, struct sock *sk, struct sk_buff *skb)
>>  {
>> @@ -91,10 +103,12 @@ 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;
>> +	if (static_branch_unlikely(&br_input_locked_port_feature)) {
>> +		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;
>> +		}
>>  	}
>>  
>>  	nbp_switchdev_frame_mark(p, skb);
>> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
>> index 7d4432ca9a20..e3dbe9fed75c 100644
>> --- a/net/bridge/br_netlink.c
>> +++ b/net/bridge/br_netlink.c
>> @@ -860,6 +860,7 @@ static int br_set_port_state(struct net_bridge_port *p, u8 state)
>>  static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
>>  			     int attrtype, unsigned long mask)
>>  {
>> +	bool locked = p->flags & BR_PORT_LOCKED;
>>  	if (!tb[attrtype])
>>  		return;
>>  
>> @@ -867,6 +868,11 @@ static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
>>  		p->flags |= mask;
>>  	else
>>  		p->flags &= ~mask;
>> +
>> +	if ((p->flags & BR_PORT_LOCKED) && !locked)
>> +		br_input_locked_port_add();
>> +	if (!(p->flags & BR_PORT_LOCKED) && locked)
>> +		br_input_locked_port_remove();
>>  }
>>  
>>  /* Process bridge protocol info on port */
>> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
>> index 2661dda1a92b..0ec3ef897978 100644
>> --- a/net/bridge/br_private.h
>> +++ b/net/bridge/br_private.h
>> @@ -832,6 +832,8 @@ void br_manage_promisc(struct net_bridge *br);
>>  int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
>>  
>>  /* br_input.c */
>> +void br_input_locked_port_add(void);
>> +void br_input_locked_port_remove(void);
>>  int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
>>  rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
>>  

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

[Ido Schimmel]

On Thu, Feb 10, 2022 at 10:30:01AM +0200, Nikolay Aleksandrov wrote:
> 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@gmail.com>
> > ---
> 
> 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

I think we should also check that entry does not have 'BR_FDB_LOCAL'
set. These entries point at the bridge ports themselves, but do not
actually represent hosts behind the ports. Since they are automatically
populated, a malicious host can craft packets with SMAC of the bridge
port and bypass the check.

Assuming the above is true (didn't test), would be good to add a test
case for it in the selftest.

> 
> > +			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