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-rw-r--r--include/uapi/linux/if_bridge.h55
-rw-r--r--include/uapi/linux/rtnetlink.h3
-rw-r--r--net/bridge/Makefile2
-rw-r--r--net/bridge/br_mdb.c163
-rw-r--r--net/bridge/br_multicast.c1
-rw-r--r--net/bridge/br_private.h1
-rw-r--r--security/selinux/nlmsgtab.c1
7 files changed, 225 insertions, 1 deletions
diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index b3885791e11e..9a0f6ff0d7e7 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -116,4 +116,59 @@ enum {
__IFLA_BRIDGE_MAX,
};
#define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
+
+/* Bridge multicast database attributes
+ * [MDBA_MDB] = {
+ * [MDBA_MDB_ENTRY] = {
+ * [MDBA_MDB_ENTRY_INFO]
+ * }
+ * }
+ * [MDBA_ROUTER] = {
+ * [MDBA_ROUTER_PORT]
+ * }
+ */
+enum {
+ MDBA_UNSPEC,
+ MDBA_MDB,
+ MDBA_ROUTER,
+ __MDBA_MAX,
+};
+#define MDBA_MAX (__MDBA_MAX - 1)
+
+enum {
+ MDBA_MDB_UNSPEC,
+ MDBA_MDB_ENTRY,
+ __MDBA_MDB_MAX,
+};
+#define MDBA_MDB_MAX (__MDBA_MDB_MAX - 1)
+
+enum {
+ MDBA_MDB_ENTRY_UNSPEC,
+ MDBA_MDB_ENTRY_INFO,
+ __MDBA_MDB_ENTRY_MAX,
+};
+#define MDBA_MDB_ENTRY_MAX (__MDBA_MDB_ENTRY_MAX - 1)
+
+enum {
+ MDBA_ROUTER_UNSPEC,
+ MDBA_ROUTER_PORT,
+ __MDBA_ROUTER_MAX,
+};
+#define MDBA_ROUTER_MAX (__MDBA_ROUTER_MAX - 1)
+
+struct br_port_msg {
+ __u32 ifindex;
+};
+
+struct br_mdb_entry {
+ __u32 ifindex;
+ struct {
+ union {
+ __be32 ip4;
+ struct in6_addr ip6;
+ } u;
+ __be16 proto;
+ } addr;
+};
+
#endif /* _UAPI_LINUX_IF_BRIDGE_H */
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 33d29cea37ea..354a1e7d32a3 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -125,6 +125,9 @@ enum {
RTM_GETNETCONF = 82,
#define RTM_GETNETCONF RTM_GETNETCONF
+ RTM_GETMDB = 86,
+#define RTM_GETMDB RTM_GETMDB
+
__RTM_MAX,
#define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
};
diff --git a/net/bridge/Makefile b/net/bridge/Makefile
index d0359ea8ee79..e859098f5ee9 100644
--- a/net/bridge/Makefile
+++ b/net/bridge/Makefile
@@ -12,6 +12,6 @@ bridge-$(CONFIG_SYSFS) += br_sysfs_if.o br_sysfs_br.o
bridge-$(CONFIG_BRIDGE_NETFILTER) += br_netfilter.o
-bridge-$(CONFIG_BRIDGE_IGMP_SNOOPING) += br_multicast.o
+bridge-$(CONFIG_BRIDGE_IGMP_SNOOPING) += br_multicast.o br_mdb.o
obj-$(CONFIG_BRIDGE_NF_EBTABLES) += netfilter/
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
new file mode 100644
index 000000000000..edc0d731f6b2
--- /dev/null
+++ b/net/bridge/br_mdb.c
@@ -0,0 +1,163 @@
+#include <linux/err.h>
+#include <linux/igmp.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/rculist.h>
+#include <linux/skbuff.h>
+#include <net/ip.h>
+#include <net/netlink.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#endif
+
+#include "br_private.h"
+
+static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev)
+{
+ struct net_bridge *br = netdev_priv(dev);
+ struct net_bridge_port *p;
+ struct hlist_node *n;
+ struct nlattr *nest;
+
+ if (!br->multicast_router || hlist_empty(&br->router_list))
+ return 0;
+
+ nest = nla_nest_start(skb, MDBA_ROUTER);
+ if (nest == NULL)
+ return -EMSGSIZE;
+
+ hlist_for_each_entry_rcu(p, n, &br->router_list, rlist) {
+ if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
+ goto fail;
+ }
+
+ nla_nest_end(skb, nest);
+ return 0;
+fail:
+ nla_nest_cancel(skb, nest);
+ return -EMSGSIZE;
+}
+
+static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
+ struct net_device *dev)
+{
+ struct net_bridge *br = netdev_priv(dev);
+ struct net_bridge_mdb_htable *mdb;
+ struct nlattr *nest, *nest2;
+ int i, err = 0;
+ int idx = 0, s_idx = cb->args[1];
+
+ if (br->multicast_disabled)
+ return 0;
+
+ mdb = rcu_dereference(br->mdb);
+ if (!mdb)
+ return 0;
+
+ nest = nla_nest_start(skb, MDBA_MDB);
+ if (nest == NULL)
+ return -EMSGSIZE;
+
+ for (i = 0; i < mdb->max; i++) {
+ struct hlist_node *h;
+ struct net_bridge_mdb_entry *mp;
+ struct net_bridge_port_group *p, **pp;
+ struct net_bridge_port *port;
+
+ hlist_for_each_entry_rcu(mp, h, &mdb->mhash[i], hlist[mdb->ver]) {
+ if (idx < s_idx)
+ goto skip;
+
+ nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
+ if (nest2 == NULL) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+
+ for (pp = &mp->ports;
+ (p = rcu_dereference(*pp)) != NULL;
+ pp = &p->next) {
+ port = p->port;
+ if (port) {
+ struct br_mdb_entry e;
+ e.ifindex = port->dev->ifindex;
+ e.addr.u.ip4 = p->addr.u.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ e.addr.u.ip6 = p->addr.u.ip6;
+#endif
+ e.addr.proto = p->addr.proto;
+ if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
+ nla_nest_cancel(skb, nest2);
+ err = -EMSGSIZE;
+ goto out;
+ }
+ }
+ }
+ nla_nest_end(skb, nest2);
+ skip:
+ idx++;
+ }
+ }
+
+out:
+ cb->args[1] = idx;
+ nla_nest_end(skb, nest);
+ return err;
+}
+
+static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net_device *dev;
+ struct net *net = sock_net(skb->sk);
+ struct nlmsghdr *nlh = NULL;
+ int idx = 0, s_idx;
+
+ s_idx = cb->args[0];
+
+ rcu_read_lock();
+
+ /* TODO: in case of rehashing, we need to check
+ * consistency for dumping.
+ */
+ cb->seq = net->dev_base_seq;
+
+ for_each_netdev_rcu(net, dev) {
+ if (dev->priv_flags & IFF_EBRIDGE) {
+ struct br_port_msg *bpm;
+
+ if (idx < s_idx)
+ goto skip;
+
+ nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, RTM_GETMDB,
+ sizeof(*bpm), NLM_F_MULTI);
+ if (nlh == NULL)
+ break;
+
+ bpm = nlmsg_data(nlh);
+ bpm->ifindex = dev->ifindex;
+ if (br_mdb_fill_info(skb, cb, dev) < 0)
+ goto out;
+ if (br_rports_fill_info(skb, cb, dev) < 0)
+ goto out;
+
+ cb->args[1] = 0;
+ nlmsg_end(skb, nlh);
+ skip:
+ idx++;
+ }
+ }
+
+out:
+ if (nlh)
+ nlmsg_end(skb, nlh);
+ rcu_read_unlock();
+ cb->args[0] = idx;
+ return skb->len;
+}
+
+void br_mdb_init(void)
+{
+ rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
+}
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index a2a7a1a79081..68e375ac93bd 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1605,6 +1605,7 @@ void br_multicast_init(struct net_bridge *br)
br_multicast_querier_expired, (unsigned long)br);
setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
(unsigned long)br);
+ br_mdb_init();
}
void br_multicast_open(struct net_bridge *br)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index cd86222cf5e3..ae0a6ec0a702 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -433,6 +433,7 @@ extern int br_multicast_set_port_router(struct net_bridge_port *p,
extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
+extern void br_mdb_init(void);
static inline bool br_multicast_is_router(struct net_bridge *br)
{
diff --git a/security/selinux/nlmsgtab.c b/security/selinux/nlmsgtab.c
index d309e7f472d8..163aaa77d5aa 100644
--- a/security/selinux/nlmsgtab.c
+++ b/security/selinux/nlmsgtab.c
@@ -67,6 +67,7 @@ static struct nlmsg_perm nlmsg_route_perms[] =
{ RTM_GETADDRLABEL, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_GETDCB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_SETDCB, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
+ { RTM_GETMDB, NETLINK_ROUTE_SOCKET__NLMSG_READ },
};
static struct nlmsg_perm nlmsg_tcpdiag_perms[] =
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