bridge: add flags to distinguish permanent mdb entires

This patch adds a flag to each mdb entry, so that we can distinguish
permanent entries with temporary entries.

Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index afbb18a..5db2975 100644 (file)
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -163,6 +163,9 @@ struct br_port_msg {
 
 struct br_mdb_entry {
        __u32 ifindex;
+#define MDB_TEMPORARY 0
+#define MDB_PERMANENT 1
+       __u8 state;
        struct {
                union {
                        __be32  ip4;

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index 6f0a2ee..9cf5d2b 100644 (file)
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -83,6 +83,7 @@ static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
                                if (port) {
                                        struct br_mdb_entry e;
                                        e.ifindex = port->dev->ifindex;
+                                       e.state = p->state;
                                        e.addr.u.ip4 = p->addr.u.ip4;
 #if IS_ENABLED(CONFIG_IPV6)
                                        e.addr.u.ip6 = p->addr.u.ip6;
@@ -253,6 +254,8 @@ static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
 #endif
        } else
                return false;
+       if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
+               return false;
 
        return true;
 }
@@ -310,7 +313,7 @@ static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
 }
 
 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
-                           struct br_ip *group)
+                           struct br_ip *group, unsigned char state)
 {
        struct net_bridge_mdb_entry *mp;
        struct net_bridge_port_group *p;
@@ -336,7 +339,7 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
                        break;
        }
 
-       p = br_multicast_new_port_group(port, group, *pp);
+       p = br_multicast_new_port_group(port, group, *pp, state);
        if (unlikely(!p))
                return -ENOMEM;
        rcu_assign_pointer(*pp, p);
@@ -373,7 +376,7 @@ static int __br_mdb_add(struct net *net, struct net_bridge *br,
 #endif
 
        spin_lock_bh(&br->multicast_lock);
-       ret = br_mdb_add_group(br, p, &ip);
+       ret = br_mdb_add_group(br, p, &ip, entry->state);
        spin_unlock_bh(&br->multicast_lock);
        return ret;
 }

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 2561af9..dce9def 100644 (file)
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -279,7 +279,7 @@ static void br_multicast_port_group_expired(unsigned long data)
 
        spin_lock(&br->multicast_lock);
        if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
-           hlist_unhashed(&pg->mglist))
+           hlist_unhashed(&pg->mglist) || pg->state & MDB_PERMANENT)
                goto out;
 
        br_multicast_del_pg(br, pg);
@@ -622,7 +622,8 @@ out:
 struct net_bridge_port_group *br_multicast_new_port_group(
                        struct net_bridge_port *port,
                        struct br_ip *group,
-                       struct net_bridge_port_group __rcu *next)
+                       struct net_bridge_port_group __rcu *next,
+                       unsigned char state)
 {
        struct net_bridge_port_group *p;
 
@@ -632,6 +633,7 @@ struct net_bridge_port_group *br_multicast_new_port_group(
 
        p->addr = *group;
        p->port = port;
+       p->state = state;
        rcu_assign_pointer(p->next, next);
        hlist_add_head(&p->mglist, &port->mglist);
        setup_timer(&p->timer, br_multicast_port_group_expired,
@@ -674,7 +676,7 @@ static int br_multicast_add_group(struct net_bridge *br,
                        break;
        }
 
-       p = br_multicast_new_port_group(port, group, *pp);
+       p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
        if (unlikely(!p))
                goto err;
        rcu_assign_pointer(*pp, p);

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index f21a739..49b85af 100644 (file)
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -83,6 +83,7 @@ struct net_bridge_port_group {
        struct rcu_head                 rcu;
        struct timer_list               timer;
        struct br_ip                    addr;
+       unsigned char                   state;
 };
 
 struct net_bridge_mdb_entry
@@ -443,7 +444,8 @@ extern void br_multicast_free_pg(struct rcu_head *head);
 extern struct net_bridge_port_group *br_multicast_new_port_group(
                                struct net_bridge_port *port,
                                struct br_ip *group,
-                               struct net_bridge_port_group *next);
+                               struct net_bridge_port_group *next,
+                               unsigned char state);
 extern void br_mdb_init(void);
 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
                          struct br_ip *group, int type);