Bridge hub_enabled patch: this patch adds the hub_enabled option for bridge.
By default the hub_enabled flag is set to 1. In this case nothing changes, the
bridge, as usually, acts as a hub and flood_forward the input pkts to all its
ports. When hun_enabled is set to 0, the bridge stops to flood_forward the input
traffic and takes only the pkts sent to it.
Disabling the hub option is useful to join multiple interfaces into a unique
virtual
one, thus becomes possible to have easily an ad-hoc network topology using
multiple
interfaces.
For example:
A(eth0) --- (eth1)B(eth0) --- (eth1)C
BRIDGE
NO HUB
br0
A and C must not be directly connected, and B must have only one interface, in
this case br0.
This scenario is possible only disabling the hub behavior of the bridge.
To clarify, this topology is the same of having:
A(wlan0)\ /(wlan0)C
\ /
\ /
(wlan0)
B
A and C don't see each other.
Maybe the hub_enabled option may be useful for something else ^_-
The patch is simple and stupid, and it seems to work.
It can be found also here:
http://freaknet.org/alpt/src/bridge-hub/bridge-2.6.11-hub.patch
The patch to update the bridge-utils is here:
http://freaknet.org/alpt/src/bridge-hub/bridge-utils-1.0.6-hub.patch
Here attached there is only the patch for the net/bridge code.
Best Regards
PS: I'm resending this mail to linux-net because after 7 hours I don't
see it in the net-dev ml. I don't why.
--
:wq!
"I don't know nothing" The One Who reached the Thinking Matter '.'
[ Alpt --- Freaknet Medialab ]
[ GPG Key ID 441CF0EE ]
[ Key fingerprint = 8B02 26E8 831A 7BB9 81A9 5277 BFF8 037E 441C F0EE ]
diff -ru a-2.6.11/include/linux/if_bridge.h b-2.6.11/include/linux/if_bridge.h
--- a-2.6.11/include/linux/if_bridge.h 2005-03-26 21:14:05.000000000 +0100
+++ b-2.6.11/include/linux/if_bridge.h 2005-03-25 23:57:19.000000000 +0100
@@ -44,6 +44,7 @@
#define BRCTL_SET_PORT_PRIORITY 16
#define BRCTL_SET_PATH_COST 17
#define BRCTL_GET_FDB_ENTRIES 18
+#define BRCTL_SET_BRIDGE_HUB_STATE 19
#define BR_STATE_DISABLED 0
#define BR_STATE_LISTENING 1
@@ -65,6 +66,7 @@
__u8 topology_change;
__u8 topology_change_detected;
__u8 root_port;
+ __u8 hub_enabled;
__u8 stp_enabled;
__u32 ageing_time;
__u32 gc_interval;
diff -ru a-2.6.11/net/bridge/br_if.c b-2.6.11/net/bridge/br_if.c
--- a-2.6.11/net/bridge/br_if.c 2005-03-26 21:14:05.000000000 +0100
+++ b-2.6.11/net/bridge/br_if.c 2005-03-25 23:56:56.000000000 +0100
@@ -155,6 +155,8 @@
br->bridge_id.prio[1] = 0x00;
memset(br->bridge_id.addr, 0, ETH_ALEN);
+ br->hub_enabled = 1;
+
br->stp_enabled = 0;
br->designated_root = br->bridge_id;
br->root_path_cost = 0;
diff -ru a-2.6.11/net/bridge/br_input.c b-2.6.11/net/bridge/br_input.c
--- a-2.6.11/net/bridge/br_input.c 2005-03-26 21:14:05.000000000 +0100
+++ b-2.6.11/net/bridge/br_input.c 2005-03-26 22:08:38.000000000 +0100
@@ -80,12 +80,13 @@
goto out;
}
- if (dst != NULL) {
+ if (dst != NULL && br->hub_enabled) {
br_forward(dst->dst, skb);
goto out;
}
- br_flood_forward(br, skb, 0);
+ if(br->hub_enabled)
+ br_flood_forward(br, skb, 0);
out:
return 0;
diff -ru a-2.6.11/net/bridge/br_ioctl.c b-2.6.11/net/bridge/br_ioctl.c
--- a-2.6.11/net/bridge/br_ioctl.c 2005-03-26 21:14:05.000000000 +0100
+++ b-2.6.11/net/bridge/br_ioctl.c 2005-03-25 23:56:56.000000000 +0100
@@ -135,6 +135,7 @@
b.topology_change = br->topology_change;
b.topology_change_detected = br->topology_change_detected;
b.root_port = br->root_port;
+ b.hub_enabled = br->hub_enabled;
b.stp_enabled = br->stp_enabled;
b.ageing_time = jiffies_to_clock_t(br->ageing_time);
b.hello_timer_value = br_timer_value(&br->hello_timer);
@@ -247,6 +248,13 @@
return 0;
}
+ case BRCTL_SET_BRIDGE_HUB_STATE:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ br->hub_enabled = args[1]?1:0;
+ return 0;
+
case BRCTL_SET_BRIDGE_STP_STATE:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
diff -ru a-2.6.11/net/bridge/br_private.h b-2.6.11/net/bridge/br_private.h
--- a-2.6.11/net/bridge/br_private.h 2005-03-26 21:14:05.000000000 +0100
+++ b-2.6.11/net/bridge/br_private.h 2005-03-25 23:56:56.000000000 +0100
@@ -93,6 +93,8 @@
struct hlist_head hash[BR_HASH_SIZE];
struct list_head age_list;
+ unsigned char hub_enabled;
+
/* STP */
bridge_id designated_root;
bridge_id bridge_id;
diff -ru a-2.6.11/net/bridge/br_sysfs_br.c b-2.6.11/net/bridge/br_sysfs_br.c
--- a-2.6.11/net/bridge/br_sysfs_br.c 2005-03-26 21:14:05.000000000 +0100
+++ b-2.6.11/net/bridge/br_sysfs_br.c 2005-03-25 23:56:56.000000000 +0100
@@ -136,6 +136,28 @@
static CLASS_DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
store_ageing_time);
+
+static ssize_t show_hub_state(struct class_device *cd, char *buf)
+{
+ struct net_bridge *br = to_bridge(cd);
+ return sprintf(buf, "%d\n", br->hub_enabled);
+}
+
+static void set_hub_state(struct net_bridge *br, unsigned long val)
+{
+ br->hub_enabled = val;
+}
+
+static ssize_t store_hub_state(struct class_device *cd,
+ const char *buf, size_t len)
+{
+ return store_bridge_parm(cd, buf, len, set_hub_state);
+}
+
+static CLASS_DEVICE_ATTR(hub_state, S_IRUGO | S_IWUSR, show_hub_state,
+ store_hub_state);
+
+
static ssize_t show_stp_state(struct class_device *cd, char *buf)
{
struct net_bridge *br = to_bridge(cd);
@@ -246,6 +268,7 @@
&class_device_attr_hello_time.attr,
&class_device_attr_max_age.attr,
&class_device_attr_ageing_time.attr,
+ &class_device_attr_hub_state.attr,
&class_device_attr_stp_state.attr,
&class_device_attr_priority.attr,
&class_device_attr_bridge_id.attr,
pgpTxgcLa3TgS.pgp
Description: PGP signature
