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-rw-r--r--net/bridge/br_device.c2
-rw-r--r--net/bridge/br_input.c33
-rw-r--r--net/bridge/br_private.h7
-rw-r--r--net/bridge/br_sysfs_br.c34
4 files changed, 71 insertions, 5 deletions
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index ee68eee..28325d1 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -361,6 +361,8 @@ void br_dev_setup(struct net_device *dev)
memcpy(br->group_addr, br_group_address, ETH_ALEN);
br->stp_enabled = BR_NO_STP;
+ br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
+
br->designated_root = br->bridge_id;
br->bridge_max_age = br->max_age = 20 * HZ;
br->bridge_hello_time = br->hello_time = 2 * HZ;
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index f06ee39..6f9f8c0 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -162,14 +162,37 @@ rx_handler_result_t br_handle_frame(struct sk_buff **pskb)
p = br_port_get_rcu(skb->dev);
if (unlikely(is_link_local(dest))) {
- /* Pause frames shouldn't be passed up by driver anyway */
- if (skb->protocol == htons(ETH_P_PAUSE))
+ /*
+ * See IEEE 802.1D Table 7-10 Reserved addresses
+ *
+ * Assignment Value
+ * Bridge Group Address 01-80-C2-00-00-00
+ * (MAC Control) 802.3 01-80-C2-00-00-01
+ * (Link Aggregation) 802.3 01-80-C2-00-00-02
+ * 802.1X PAE address 01-80-C2-00-00-03
+ *
+ * 802.1AB LLDP 01-80-C2-00-00-0E
+ *
+ * Others reserved for future standardization
+ */
+ switch (dest[5]) {
+ case 0x00: /* Bridge Group Address */
+ /* If STP is turned off,
+ then must forward to keep loop detection */
+ if (p->br->stp_enabled == BR_NO_STP)
+ goto forward;
+ break;
+
+ case 0x01: /* IEEE MAC (Pause) */
goto drop;
- /* If STP is turned off, then forward */
- if (p->br->stp_enabled == BR_NO_STP && dest[5] == 0)
- goto forward;
+ default:
+ /* Allow selective forwarding for most other protocols */
+ if (p->br->group_fwd_mask & (1u << dest[5]))
+ goto forward;
+ }
+ /* Deliver packet to local host only */
if (NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
NULL, br_handle_local_finish)) {
return RX_HANDLER_CONSUMED; /* consumed by filter */
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 78cc364..a248fe6 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -29,6 +29,11 @@
#define BR_VERSION "2.3"
+/* Control of forwarding link local multicast */
+#define BR_GROUPFWD_DEFAULT 0
+/* Don't allow forwarding control protocols like STP and LLDP */
+#define BR_GROUPFWD_RESTRICTED 0x4007u
+
/* Path to usermode spanning tree program */
#define BR_STP_PROG "/sbin/bridge-stp"
@@ -193,6 +198,8 @@ struct net_bridge
unsigned long flags;
#define BR_SET_MAC_ADDR 0x00000001
+ u16 group_fwd_mask;
+
/* STP */
bridge_id designated_root;
bridge_id bridge_id;
diff --git a/net/bridge/br_sysfs_br.c b/net/bridge/br_sysfs_br.c
index 68b893e..c236c0e 100644
--- a/net/bridge/br_sysfs_br.c
+++ b/net/bridge/br_sysfs_br.c
@@ -149,6 +149,39 @@ static ssize_t store_stp_state(struct device *d,
static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
store_stp_state);
+static ssize_t show_group_fwd_mask(struct device *d,
+ struct device_attribute *attr, char *buf)
+{
+ struct net_bridge *br = to_bridge(d);
+ return sprintf(buf, "%#x\n", br->group_fwd_mask);
+}
+
+
+static ssize_t store_group_fwd_mask(struct device *d,
+ struct device_attribute *attr, const char *buf,
+ size_t len)
+{
+ struct net_bridge *br = to_bridge(d);
+ char *endp;
+ unsigned long val;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ val = simple_strtoul(buf, &endp, 0);
+ if (endp == buf)
+ return -EINVAL;
+
+ if (val & BR_GROUPFWD_RESTRICTED)
+ return -EINVAL;
+
+ br->group_fwd_mask = val;
+
+ return len;
+}
+static DEVICE_ATTR(group_fwd_mask, S_IRUGO | S_IWUSR, show_group_fwd_mask,
+ store_group_fwd_mask);
+
static ssize_t show_priority(struct device *d, struct device_attribute *attr,
char *buf)
{
@@ -652,6 +685,7 @@ static struct attribute *bridge_attrs[] = {
&dev_attr_max_age.attr,
&dev_attr_ageing_time.attr,
&dev_attr_stp_state.attr,
+ &dev_attr_group_fwd_mask.attr,
&dev_attr_priority.attr,
&dev_attr_bridge_id.attr,
&dev_attr_root_id.attr,
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