path: root/Documentation
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authorBernhard Thaler <bernhard.thaler@wvnet.at>2015-05-04 22:47:13 +0200
committerDavid S. Miller <davem@davemloft.net>2015-05-05 19:20:28 -0400
commit784b58a327ad16967ab64bbfa558df81980d31e9 (patch)
treed60e73f6cdc35d14985964306fcfc809d3450278 /Documentation
parentcd8ae85299d54155702a56811b2e035e63064d3d (diff)
bridge: change BR_GROUPFWD_RESTRICTED to allow forwarding of LLDP frames
BR_GROUPFWD_RESTRICTED bitmask restricts users from setting values to /sys/class/net/brX/bridge/group_fwd_mask that allow forwarding of some IEEE 802.1D Table 7-10 Reserved addresses: (MAC Control) 802.3 01-80-C2-00-00-01 (Link Aggregation) 802.3 01-80-C2-00-00-02 802.1AB LLDP 01-80-C2-00-00-0E Change BR_GROUPFWD_RESTRICTED to allow to forward LLDP frames and document group_fwd_mask. e.g. echo 16384 > /sys/class/net/brX/bridge/group_fwd_mask allows to forward LLDP frames. This may be needed for bridge setups used for network troubleshooting or any other scenario where forwarding of LLDP frames is desired (e.g. bridge connecting a virtual machine to real switch transmitting LLDP frames that virtual machine needs to receive). Tested on a simple bridge setup with two interfaces and host transmitting LLDP frames on one side of this bridge (used lldpd). Setting group_fwd_mask as described above lets LLDP frames traverse bridge. Signed-off-by: Bernhard Thaler <bernhard.thaler@wvnet.at> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-net b/Documentation/ABI/testing/sysfs-class-net
index 5ecfd72ba684..668604fc8e06 100644
--- a/Documentation/ABI/testing/sysfs-class-net
+++ b/Documentation/ABI/testing/sysfs-class-net
@@ -39,6 +39,25 @@ Description:
Format is a string, e.g: 00:11:22:33:44:55 for an Ethernet MAC
+What: /sys/class/net/<bridge iface>/bridge/group_fwd_mask
+Date: January 2012
+KernelVersion: 3.2
+Contact: netdev@vger.kernel.org
+ Bitmask to allow forwarding of link local frames with address
+ 01-80-C2-00-00-0X on a bridge device. Only values that set bits
+ not matching BR_GROUPFWD_RESTRICTED in net/bridge/br_private.h
+ allowed.
+ Default value 0 does not forward any link local frames.
+ Restricted bits:
+ 0: 01-80-C2-00-00-00 Bridge Group Address used for STP
+ 1: 01-80-C2-00-00-01 (MAC Control) 802.3 used for MAC PAUSE
+ 2: 01-80-C2-00-00-02 (Link Aggregation) 802.3ad
+ Any values not setting these bits can be used. Take special
+ care when forwarding control frames e.g. 802.1X-PAE or LLDP.
What: /sys/class/net/<iface>/broadcast
Date: April 2005
KernelVersion: 2.6.12

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