net/bridge: Add 'hairpin' port forwarding mode
Fischer, Anna [Thu, 13 Aug 2009 06:55:16 +0000 (06:55 +0000)]
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>

net/bridge/br_forward.c
net/bridge/br_if.c
net/bridge/br_private.h
net/bridge/br_sysfs_if.c

index d2c27c8..bc1704a 100644 (file)
@@ -22,7 +22,8 @@
 static inline int should_deliver(const struct net_bridge_port *p,
                                 const struct sk_buff *skb)
 {
-       return (skb->dev != p->dev && p->state == BR_STATE_FORWARDING);
+       return (((p->flags & BR_HAIRPIN_MODE) || skb->dev != p->dev) &&
+               p->state == BR_STATE_FORWARDING);
 }
 
 static inline unsigned packet_length(const struct sk_buff *skb)
index eb404dc..e486f1f 100644 (file)
@@ -256,6 +256,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
        p->path_cost = port_cost(dev);
        p->priority = 0x8000 >> BR_PORT_BITS;
        p->port_no = index;
+       p->flags = 0;
        br_init_port(p);
        p->state = BR_STATE_DISABLED;
        br_stp_port_timer_init(p);
index d5b5537..8319247 100644 (file)
@@ -81,6 +81,9 @@ struct net_bridge_port
        struct timer_list               message_age_timer;
        struct kobject                  kobj;
        struct rcu_head                 rcu;
+
+       unsigned long                   flags;
+#define BR_HAIRPIN_MODE                0x00000001
 };
 
 struct net_bridge
index 4a3cdf8..820643a 100644 (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
 };