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@cumulusnetworks.com>
Reviewed-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index 585d271..7843b98 100644 (file)
--- 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 b852664..cf01b68 100644 (file)
--- 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 7a7fd67..9019f32 100644 (file)
--- 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 7f98a7d..7207427 100644 (file)
--- 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 015f465..9f5eb05 100644 (file)
--- 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 742f40a..11520ed 100644 (file)
--- 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 fd31ad8..f99c5bf 100644 (file)
--- 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
 };