thr3ads.net - Linux Ethernet Bridging - [Bridge] [PATCH net-next] net: bridge: add support for port isolation [May 2018]

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Nikolay Aleksandrov

2018-May-24 08:56 UTC

[Bridge] [PATCH net-next] net: bridge: add support for port isolation

This patch adds support for a new port flag - BR_ISOLATED. If it is set
then isolated ports cannot communicate between each other, but they can
still communicate with non-isolated ports. The same can be achieved via
ACLs but they can't scale with large number of ports and also the
complexity of the rules grows. This feature can be used to achieve
isolated vlan functionality (similar to pvlan) as well, though currently
it will be port-wide (for all vlans on the port). The new test in
should_deliver uses data that is already cache hot and the new boolean
is used to avoid an additional source port test in should_deliver.

Signed-off-by: Nikolay Aleksandrov <nikolay at cumulusnetworks.com>
---
 include/linux/if_bridge.h    | 1 +
 include/uapi/linux/if_link.h | 1 +
 net/bridge/br_forward.c      | 3 ++-
 net/bridge/br_input.c        | 1 +
 net/bridge/br_netlink.c      | 9 ++++++++-
 net/bridge/br_private.h      | 9 +++++++++
 net/bridge/br_sysfs_if.c     | 2 ++
 7 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index 585d27182425..7843b98e1c6e 100644
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -50,6 +50,7 @@ struct br_ip_list {
 #define BR_VLAN_TUNNEL		BIT(13)
 #define BR_BCAST_FLOOD		BIT(14)
 #define BR_NEIGH_SUPPRESS	BIT(15)
+#define BR_ISOLATED		BIT(16)
 
 #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
 
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index b85266420bfb..cf01b6824244 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -333,6 +333,7 @@ enum {
 	IFLA_BRPORT_BCAST_FLOOD,
 	IFLA_BRPORT_GROUP_FWD_MASK,
 	IFLA_BRPORT_NEIGH_SUPPRESS,
+	IFLA_BRPORT_ISOLATED,
 	__IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 7a7fd672ccf2..9019f326fe81 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -30,7 +30,8 @@ static inline int should_deliver(const struct net_bridge_port
*p,
 	vg = nbp_vlan_group_rcu(p);
 	return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev)
&&
 		br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING
&&
-		nbp_switchdev_allowed_egress(p, skb);
+		nbp_switchdev_allowed_egress(p, skb) &&
+		!br_skb_isolated(p, skb);
 }
 
 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff
*skb)
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 7f98a7d25866..72074276c088 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -114,6 +114,7 @@ int br_handle_frame_finish(struct net *net, struct sock *sk,
struct sk_buff *skb
 		goto drop;
 
 	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
+	BR_INPUT_SKB_CB(skb)->src_port_isolated = !!(p->flags &
BR_ISOLATED);
 
 	if (IS_ENABLED(CONFIG_INET) &&
 	    (skb->protocol == htons(ETH_P_ARP) ||
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 015f465c514b..9f5eb05b0373 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -139,6 +139,7 @@ static inline size_t br_port_info_size(void)
 		+ nla_total_size(1)	/* IFLA_BRPORT_PROXYARP_WIFI */
 		+ 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(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 */
@@ -213,7 +214,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
 							BR_VLAN_TUNNEL)) ||
 	    nla_put_u16(skb, IFLA_BRPORT_GROUP_FWD_MASK, p->group_fwd_mask) ||
 	    nla_put_u8(skb, IFLA_BRPORT_NEIGH_SUPPRESS,
-		       !!(p->flags & BR_NEIGH_SUPPRESS)))
+		       !!(p->flags & BR_NEIGH_SUPPRESS)) ||
+	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
 		return -EMSGSIZE;
 
 	timerval = br_timer_value(&p->message_age_timer);
@@ -660,6 +662,7 @@ static const struct nla_policy
br_port_policy[IFLA_BRPORT_MAX + 1] = {
 	[IFLA_BRPORT_VLAN_TUNNEL] = { .type = NLA_U8 },
 	[IFLA_BRPORT_GROUP_FWD_MASK] = { .type = NLA_U16 },
 	[IFLA_BRPORT_NEIGH_SUPPRESS] = { .type = NLA_U8 },
+	[IFLA_BRPORT_ISOLATED]	= { .type = NLA_U8 },
 };
 
 /* Change the state of the port and notify spanning tree */
@@ -810,6 +813,10 @@ static int br_setport(struct net_bridge_port *p, struct
nlattr *tb[])
 	if (err)
 		return err;
 
+	err = br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
+	if (err)
+		return err;
+
 	br_port_flags_change(p, old_flags ^ p->flags);
 	return 0;
 }
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 742f40aefdaf..11520ed528b0 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -423,6 +423,7 @@ struct br_input_skb_cb {
 #endif
 
 	bool proxyarp_replied;
+	bool src_port_isolated;
 
 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 	bool vlan_filtered;
@@ -574,6 +575,14 @@ int br_forward_finish(struct net *net, struct sock *sk,
struct sk_buff *skb);
 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 
+/* return true if both source port and dest port are isolated */
+static inline bool br_skb_isolated(const struct net_bridge_port *to,
+				   const struct sk_buff *skb)
+{
+	return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
+	       (to->flags & BR_ISOLATED);
+}
+
 /* br_if.c */
 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
 int br_add_bridge(struct net *net, const char *name);
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index fd31ad83ec7b..f99c5bf5c906 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -192,6 +192,7 @@ BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
 BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
 BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
 BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
+BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
@@ -243,6 +244,7 @@ static const struct brport_attribute *brport_attrs[] = {
 	&brport_attr_broadcast_flood,
 	&brport_attr_group_fwd_mask,
 	&brport_attr_neigh_suppress,
+	&brport_attr_isolated,
 	NULL
 };
 
-- 
2.11.0

Toshiaki Makita

2018-May-25 00:47 UTC

head link

[Bridge] [PATCH net-next] net: bridge: add support for port isolation

On 2018/05/24 17:56, Nikolay Aleksandrov wrote:> This patch adds support for a new port flag - BR_ISOLATED. If it is set
> then isolated ports cannot communicate between each other, but they can
> still communicate with non-isolated ports. The same can be achieved via
> ACLs but they can't scale with large number of ports and also the
> complexity of the rules grows. This feature can be used to achieve
> isolated vlan functionality (similar to pvlan) as well, though currently
> it will be port-wide (for all vlans on the port). The new test in
> should_deliver uses data that is already cache hot and the new boolean
> is used to avoid an additional source port test in should_deliver.
> 
> Signed-off-by: Nikolay Aleksandrov <nikolay at cumulusnetworks.com>
Sometimes I need this kind of configuration and used vlan for such
cases. I guess it does not scale for your case so added this feature.
I wonder if this kind of feature is common in hardware switches.

FWIW,

Reviewed-by: Toshiaki Makita <makita.toshiaki at lab.ntt.co.jp>
> ---
>  include/linux/if_bridge.h    | 1 +
>  include/uapi/linux/if_link.h | 1 +
>  net/bridge/br_forward.c      | 3 ++-
>  net/bridge/br_input.c        | 1 +
>  net/bridge/br_netlink.c      | 9 ++++++++-
>  net/bridge/br_private.h      | 9 +++++++++
>  net/bridge/br_sysfs_if.c     | 2 ++
>  7 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
> index 585d27182425..7843b98e1c6e 100644
> --- a/include/linux/if_bridge.h
> +++ b/include/linux/if_bridge.h
> @@ -50,6 +50,7 @@ struct br_ip_list {
>  #define BR_VLAN_TUNNEL		BIT(13)
>  #define BR_BCAST_FLOOD		BIT(14)
>  #define BR_NEIGH_SUPPRESS	BIT(15)
> +#define BR_ISOLATED		BIT(16)
>  
>  #define BR_DEFAULT_AGEING_TIME	(300 * HZ)
>  
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index b85266420bfb..cf01b6824244 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -333,6 +333,7 @@ enum {
>  	IFLA_BRPORT_BCAST_FLOOD,
>  	IFLA_BRPORT_GROUP_FWD_MASK,
>  	IFLA_BRPORT_NEIGH_SUPPRESS,
> +	IFLA_BRPORT_ISOLATED,
>  	__IFLA_BRPORT_MAX
>  };
>  #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
> diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
> index 7a7fd672ccf2..9019f326fe81 100644
> --- a/net/bridge/br_forward.c
> +++ b/net/bridge/br_forward.c
> @@ -30,7 +30,8 @@ static inline int should_deliver(const struct
net_bridge_port *p,
>  	vg = nbp_vlan_group_rcu(p);
>  	return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev)
&&
>  		br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING
&&
> -		nbp_switchdev_allowed_egress(p, skb);
> +		nbp_switchdev_allowed_egress(p, skb) &&
> +		!br_skb_isolated(p, skb);
>  }
>  
>  int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct
sk_buff *skb)
> diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
> index 7f98a7d25866..72074276c088 100644
> --- a/net/bridge/br_input.c
> +++ b/net/bridge/br_input.c
> @@ -114,6 +114,7 @@ int br_handle_frame_finish(struct net *net, struct sock
*sk, struct sk_buff *skb
>  		goto drop;
>  
>  	BR_INPUT_SKB_CB(skb)->brdev = br->dev;
> +	BR_INPUT_SKB_CB(skb)->src_port_isolated = !!(p->flags &
BR_ISOLATED);
>  
>  	if (IS_ENABLED(CONFIG_INET) &&
>  	    (skb->protocol == htons(ETH_P_ARP) ||
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 015f465c514b..9f5eb05b0373 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -139,6 +139,7 @@ static inline size_t br_port_info_size(void)
>  		+ nla_total_size(1)	/* IFLA_BRPORT_PROXYARP_WIFI */
>  		+ 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(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 */
> @@ -213,7 +214,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
>  							BR_VLAN_TUNNEL)) ||
>  	    nla_put_u16(skb, IFLA_BRPORT_GROUP_FWD_MASK, p->group_fwd_mask) ||
>  	    nla_put_u8(skb, IFLA_BRPORT_NEIGH_SUPPRESS,
> -		       !!(p->flags & BR_NEIGH_SUPPRESS)))
> +		       !!(p->flags & BR_NEIGH_SUPPRESS)) ||
> +	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags &
BR_ISOLATED)))
>  		return -EMSGSIZE;
>  
>  	timerval = br_timer_value(&p->message_age_timer);
> @@ -660,6 +662,7 @@ static const struct nla_policy
br_port_policy[IFLA_BRPORT_MAX + 1] = {
>  	[IFLA_BRPORT_VLAN_TUNNEL] = { .type = NLA_U8 },
>  	[IFLA_BRPORT_GROUP_FWD_MASK] = { .type = NLA_U16 },
>  	[IFLA_BRPORT_NEIGH_SUPPRESS] = { .type = NLA_U8 },
> +	[IFLA_BRPORT_ISOLATED]	= { .type = NLA_U8 },
>  };
>  
>  /* Change the state of the port and notify spanning tree */
> @@ -810,6 +813,10 @@ static int br_setport(struct net_bridge_port *p,
struct nlattr *tb[])
>  	if (err)
>  		return err;
>  
> +	err = br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
> +	if (err)
> +		return err;
> +
>  	br_port_flags_change(p, old_flags ^ p->flags);
>  	return 0;
>  }
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 742f40aefdaf..11520ed528b0 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -423,6 +423,7 @@ struct br_input_skb_cb {
>  #endif
>  
>  	bool proxyarp_replied;
> +	bool src_port_isolated;
>  
>  #ifdef CONFIG_BRIDGE_VLAN_FILTERING
>  	bool vlan_filtered;
> @@ -574,6 +575,14 @@ int br_forward_finish(struct net *net, struct sock
*sk, struct sk_buff *skb);
>  void br_flood(struct net_bridge *br, struct sk_buff *skb,
>  	      enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
>  
> +/* return true if both source port and dest port are isolated */
> +static inline bool br_skb_isolated(const struct net_bridge_port *to,
> +				   const struct sk_buff *skb)
> +{
> +	return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
> +	       (to->flags & BR_ISOLATED);
> +}
> +
>  /* br_if.c */
>  void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
>  int br_add_bridge(struct net *net, const char *name);
> diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
> index fd31ad83ec7b..f99c5bf5c906 100644
> --- a/net/bridge/br_sysfs_if.c
> +++ b/net/bridge/br_sysfs_if.c
> @@ -192,6 +192,7 @@ BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
>  BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
>  BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
>  BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
> +BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
>  
>  #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
>  static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
> @@ -243,6 +244,7 @@ static const struct brport_attribute *brport_attrs[] =
{
>  	&brport_attr_broadcast_flood,
>  	&brport_attr_group_fwd_mask,
>  	&brport_attr_neigh_suppress,
> +	&brport_attr_isolated,
>  	NULL
>  };
>  
> 
-- 
Toshiaki Makita

David Miller

2018-May-25 18:46 UTC

head link

[Bridge] [PATCH net-next] net: bridge: add support for port isolation

From: Nikolay Aleksandrov <nikolay at cumulusnetworks.com>
Date: Thu, 24 May 2018 11:56:48 +0300
> This patch adds support for a new port flag - BR_ISOLATED. If it is set
> then isolated ports cannot communicate between each other, but they can
> still communicate with non-isolated ports. The same can be achieved via
> ACLs but they can't scale with large number of ports and also the
> complexity of the rules grows. This feature can be used to achieve
> isolated vlan functionality (similar to pvlan) as well, though currently
> it will be port-wide (for all vlans on the port). The new test in
> should_deliver uses data that is already cache hot and the new boolean
> is used to avoid an additional source port test in should_deliver.
> 
> Signed-off-by: Nikolay Aleksandrov <nikolay at cumulusnetworks.com>
Applied, thanks Nikolay.

Linux Ethernet Bridging - May 2018 - [Bridge] [PATCH net-next] net: bridge: add support for port isolation

[Bridge] [PATCH net-next] net: bridge: add support for port isolation

[Bridge] [PATCH net-next] net: bridge: add support for port isolation

[Bridge] [PATCH net-next] net: bridge: add support for port isolation