146 lines
5.3 KiB
Diff
146 lines
5.3 KiB
Diff
From: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
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Date: Thu, 24 May 2018 11:56:48 +0300
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Subject: [PATCH] net: bridge: add support for port isolation
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This patch adds support for a new port flag - BR_ISOLATED. If it is set
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then isolated ports cannot communicate between each other, but they can
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still communicate with non-isolated ports. The same can be achieved via
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ACLs but they can't scale with large number of ports and also the
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complexity of the rules grows. This feature can be used to achieve
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isolated vlan functionality (similar to pvlan) as well, though currently
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it will be port-wide (for all vlans on the port). The new test in
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should_deliver uses data that is already cache hot and the new boolean
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is used to avoid an additional source port test in should_deliver.
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Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
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Reviewed-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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--- a/include/uapi/linux/if_link.h
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+++ b/include/uapi/linux/if_link.h
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@@ -326,6 +326,8 @@ enum {
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IFLA_BRPORT_MCAST_TO_UCAST,
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IFLA_BRPORT_VLAN_TUNNEL,
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IFLA_BRPORT_BCAST_FLOOD,
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+ IFLA_BRPORT_NEIGH_SUPPRESS,
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+ IFLA_BRPORT_ISOLATED,
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__IFLA_BRPORT_MAX
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};
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#define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
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--- a/net/bridge/br_forward.c
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+++ b/net/bridge/br_forward.c
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@@ -30,7 +30,8 @@ static inline int should_deliver(const s
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vg = nbp_vlan_group_rcu(p);
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return ((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
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br_allowed_egress(vg, skb) && p->state == BR_STATE_FORWARDING &&
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- nbp_switchdev_allowed_egress(p, skb);
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+ nbp_switchdev_allowed_egress(p, skb) &&
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+ !br_skb_isolated(p, skb);
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}
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int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
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--- a/net/bridge/br_input.c
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+++ b/net/bridge/br_input.c
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@@ -170,6 +170,7 @@ int br_handle_frame_finish(struct net *n
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goto drop;
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BR_INPUT_SKB_CB(skb)->brdev = br->dev;
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+ BR_INPUT_SKB_CB(skb)->src_port_isolated = !!(p->flags & BR_ISOLATED);
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if (IS_ENABLED(CONFIG_INET) && skb->protocol == htons(ETH_P_ARP))
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br_do_proxy_arp(skb, br, vid, p);
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--- a/net/bridge/br_netlink.c
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+++ b/net/bridge/br_netlink.c
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@@ -138,6 +138,7 @@ static inline size_t br_port_info_size(v
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+ nla_total_size(1) /* IFLA_BRPORT_PROXYARP */
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+ nla_total_size(1) /* IFLA_BRPORT_PROXYARP_WIFI */
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+ nla_total_size(1) /* IFLA_BRPORT_VLAN_TUNNEL */
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+ + nla_total_size(1) /* IFLA_BRPORT_ISOLATED */
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+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_ROOT_ID */
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+ nla_total_size(sizeof(struct ifla_bridge_id)) /* IFLA_BRPORT_BRIDGE_ID */
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+ nla_total_size(sizeof(u16)) /* IFLA_BRPORT_DESIGNATED_PORT */
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@@ -208,7 +209,8 @@ static int br_port_fill_attrs(struct sk_
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p->topology_change_ack) ||
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nla_put_u8(skb, IFLA_BRPORT_CONFIG_PENDING, p->config_pending) ||
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nla_put_u8(skb, IFLA_BRPORT_VLAN_TUNNEL, !!(p->flags &
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- BR_VLAN_TUNNEL)))
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+ BR_VLAN_TUNNEL)) ||
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+ nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
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return -EMSGSIZE;
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timerval = br_timer_value(&p->message_age_timer);
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@@ -637,6 +639,7 @@ static const struct nla_policy br_port_p
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[IFLA_BRPORT_MCAST_TO_UCAST] = { .type = NLA_U8 },
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[IFLA_BRPORT_MCAST_FLOOD] = { .type = NLA_U8 },
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[IFLA_BRPORT_BCAST_FLOOD] = { .type = NLA_U8 },
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+ [IFLA_BRPORT_ISOLATED] = { .type = NLA_U8 },
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};
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/* Change the state of the port and notify spanning tree */
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@@ -773,6 +776,11 @@ static int br_setport(struct net_bridge_
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return err;
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}
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#endif
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+
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+ err = br_set_port_flag(p, tb, IFLA_BRPORT_ISOLATED, BR_ISOLATED);
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+ if (err)
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+ return err;
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+
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br_port_flags_change(p, old_flags ^ p->flags);
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return 0;
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}
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--- a/net/bridge/br_private.h
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+++ b/net/bridge/br_private.h
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@@ -407,6 +407,7 @@ struct br_input_skb_cb {
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#endif
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bool proxyarp_replied;
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+ bool src_port_isolated;
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#ifdef CONFIG_BRIDGE_VLAN_FILTERING
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bool vlan_filtered;
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@@ -554,6 +555,14 @@ int br_forward_finish(struct net *net, s
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void br_flood(struct net_bridge *br, struct sk_buff *skb,
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enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
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+/* return true if both source port and dest port are isolated */
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+static inline bool br_skb_isolated(const struct net_bridge_port *to,
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+ const struct sk_buff *skb)
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+{
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+ return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
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+ (to->flags & BR_ISOLATED);
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+}
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+
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/* br_if.c */
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void br_port_carrier_check(struct net_bridge_port *p);
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int br_add_bridge(struct net *net, const char *name);
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--- a/net/bridge/br_sysfs_if.c
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+++ b/net/bridge/br_sysfs_if.c
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@@ -174,6 +174,7 @@ BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
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BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
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BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
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BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
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+BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
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#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
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static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
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@@ -223,6 +224,7 @@ static const struct brport_attribute *br
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&brport_attr_proxyarp_wifi,
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&brport_attr_multicast_flood,
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&brport_attr_broadcast_flood,
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+ &brport_attr_isolated,
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NULL
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};
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--- a/include/linux/if_bridge.h
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+++ b/include/linux/if_bridge.h
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@@ -49,6 +49,7 @@ struct br_ip_list {
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#define BR_MULTICAST_TO_UNICAST BIT(12)
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#define BR_VLAN_TUNNEL BIT(13)
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#define BR_BCAST_FLOOD BIT(14)
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+#define BR_ISOLATED BIT(16)
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#define BR_DEFAULT_AGEING_TIME (300 * HZ)
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