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net/bridge: Add 'hairpin' port forwarding mode

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This patch adds a 'hairpin' (also called 'reflective relay') mode
port configuration to the Linux Ethernet bridge kernel module.
A bridge supporting hairpin forwarding mode can send frames back
out through the port the frame was received on.

Hairpin mode is required to support basic VEPA (Virtual
Ethernet Port Aggregator) capabilities.

You can find additional information on VEPA here:
http://tech.groups.yahoo.com/group/evb/
http://www.ieee802.org/1/files/public/docs2009/new-hudson-vepa_seminar-20090514d.pdf
http://www.internet2.edu/presentations/jt2009jul/20090719-congdon.pdf

An additional patch 'bridge-utils: Add 'hairpin' port forwarding mode'
is provided to allow configuring hairpin mode from userspace tools.

Signed-off-by: Paul Congdon <paul.congdon@hp.com>
Signed-off-by: Anna Fischer <anna.fischer@hp.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Fischer, Anna
2009-08-13 06:55:16 +00:00
committed by David S. Miller
parent 8dd07086a1
commit 3982d3d28b
4 changed files with 23 additions and 1 deletions
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net/bridge/br_sysfs_if.c
+17
View File
@@ -143,6 +143,22 @@ static ssize_t store_flush(struct net_bridge_port *p, unsigned long v)
}
static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf)
{
int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0;
return sprintf(buf, "%d\n", hairpin_mode);
}
static ssize_t store_hairpin_mode(struct net_bridge_port *p, unsigned long v)
{
if (v)
p->flags |= BR_HAIRPIN_MODE;
else
p->flags &= ~BR_HAIRPIN_MODE;
return 0;
}
static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR,
show_hairpin_mode, store_hairpin_mode);
static struct brport_attribute *brport_attrs[] = {
&brport_attr_path_cost,
&brport_attr_priority,
@@ -159,6 +175,7 @@ static struct brport_attribute *brport_attrs[] = {
&brport_attr_forward_delay_timer,
&brport_attr_hold_timer,
&brport_attr_flush,
&brport_attr_hairpin_mode,
NULL
};