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net: bridge: add per-port group_fwd_mask with less restrictions

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We need to be able to transparently forward most link-local frames via
tunnels (e.g. vxlan, qinq). Currently the bridge's group_fwd_mask has a
mask which restricts the forwarding of STP and LACP, but we need to be able
to forward these over tunnels and control that forwarding on a per-port
basis thus add a new per-port group_fwd_mask option which only disallows
mac pause frames to be forwarded (they're always dropped anyway).
The patch does not change the current default situation - all of the others
are still restricted unless configured for forwarding.
We have successfully tested this patch with LACP and STP forwarding over
VxLAN and qinq tunnels.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov
2017-09-27 16:12:44 +03:00
committed by David S. Miller
parent de9c8a6a5f
commit 5af48b59f3
5 changed files with 42 additions and 2 deletions
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18
net/bridge/br_sysfs_if.c
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@@ -165,6 +165,23 @@ static int store_flush(struct net_bridge_port *p, unsigned long v)
}
static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf)
{
return sprintf(buf, "%#x\n", p->group_fwd_mask);
}
static int store_group_fwd_mask(struct net_bridge_port *p,
unsigned long v)
{
if (v & BR_GROUPFWD_MACPAUSE)
return -EINVAL;
p->group_fwd_mask = v;
return 0;
}
static BRPORT_ATTR(group_fwd_mask, S_IRUGO | S_IWUSR, show_group_fwd_mask,
store_group_fwd_mask);
BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
@@ -223,6 +240,7 @@ static const struct brport_attribute *brport_attrs[] = {
&brport_attr_proxyarp_wifi,
&brport_attr_multicast_flood,
&brport_attr_broadcast_flood,
&brport_attr_group_fwd_mask,
NULL
};