bridge: Prepare for forwarding another bridge group addresses
If a bridge is an 802.1ad bridge, it must forward another bridge group
addresses (the Nearest Customer Bridge group addresses).
(For details, see IEEE 802.1Q-2011 8.6.3.)
As user might not want group_fwd_mask to be modified by enabling 802.1ad,
introduce a new mask, group_fwd_mask_required, which indicates addresses
the bridge wants to forward. This will be set by enabling 802.1ad.
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 1b797c4..568cccd 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -378,6 +378,7 @@
br->stp_enabled = BR_NO_STP;
br->group_fwd_mask = BR_GROUPFWD_DEFAULT;
+ br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
br->designated_root = br->bridge_id;
br->bridge_max_age = br->max_age = 20 * HZ;
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 04d6348..366c436 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -177,6 +177,8 @@
p = br_port_get_rcu(skb->dev);
if (unlikely(is_link_local_ether_addr(dest))) {
+ u16 fwd_mask = p->br->group_fwd_mask_required;
+
/*
* See IEEE 802.1D Table 7-10 Reserved addresses
*
@@ -194,7 +196,8 @@
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)
+ if (p->br->stp_enabled == BR_NO_STP ||
+ fwd_mask & (1u << dest[5]))
goto forward;
break;
@@ -203,7 +206,8 @@
default:
/* Allow selective forwarding for most other protocols */
- if (p->br->group_fwd_mask & (1u << dest[5]))
+ fwd_mask |= p->br->group_fwd_mask;
+ if (fwd_mask & (1u << dest[5]))
goto forward;
}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 13e570e..4eba348 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -35,6 +35,8 @@
#define BR_GROUPFWD_DEFAULT 0
/* Don't allow forwarding control protocols like STP and LLDP */
#define BR_GROUPFWD_RESTRICTED 0x4007u
+/* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
+#define BR_GROUPFWD_8021AD 0xB801u
/* Path to usermode spanning tree program */
#define BR_STP_PROG "/sbin/bridge-stp"
@@ -226,6 +228,7 @@
bool nf_call_arptables;
#endif
u16 group_fwd_mask;
+ u16 group_fwd_mask_required;
/* STP */
bridge_id designated_root;